Geo: Enables nodes to be removed even without proper license

Closes #788

See merge request !978

Rename SlackNotificationService back to SlackService

## What does this MR do?

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8191#note_20310845

## What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/25843

/cc @yorickpeterse @stanhu @smcgivern @felipe_artur @ayufan

See merge request !984

Ability to start dedicated Sidekiq processes

This adds the ability to start Sidekiq processes for specific queues. See https://gitlab.com/gitlab-org/gitlab-ee/issues/1282 for more information.

See merge request !922

CE upstream

See merge request !981

These processes are managed by ./bin/sidekiq-cluster. This script can
start multiple Sidekiq processes processing a dedicated list of queues.
Signals sent to the wrapper are forwarded to the underlying Sidekiq
processes.

Update validates_hostname to 1.0.6 to fix a bug in parsing hexadecimal-looking domain names

validates_hostname <= 1.0.5 has a bug that breaks hostnames that could be interpreted as hexadecimal numbers. This is fixed in https://github.com/KimNorgaard/validates_hostname/pull/7

Update our version of the gem to one that includes this fix, and add a test for it.

/cc @cpallares @0x7cc

Can we get this into 8.15 do you think?

Closes #827

See merge request !982

Resolve ""Send Email to Users" Feature does not respect blocked users"

See merge request !945

Align milestone column header with count number

## What does this MR do?
- Aligns the milestone column header with the count number
- Prevents the count from wrapping below the column header

## Why was this MR needed?
- Count number was being pushed below the column header text if the text was too long

## Screenshots (if relevant)
- see issue sceenshots for before #25810 
- fixed version
![milestones](/uploads/ca12c290abe814b457ad3b2fb86f7696/milestones.png)


## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #25810

See merge request !8177

Update font size of detail page header to 14px

Before:    
![Screen_Shot_2016-12-19_at_2.55.08_PM](/uploads/ff1544631ff376c3039674ac45eec696/Screen_Shot_2016-12-19_at_2.55.08_PM.png)
After:   
![Screen_Shot_2016-12-19_at_2.54.48_PM](/uploads/8a1038cc851e186eddada625b8c8de83/Screen_Shot_2016-12-19_at_2.54.48_PM.png)

Closes #25735

See merge request !8183

Remove inline-block styling from status

Before:   
![Screen_Shot_2016-12-19_at_2.13.42_PM](/uploads/2bb7bc84f97fb3489854518e35349203/Screen_Shot_2016-12-19_at_2.13.42_PM.png)
After:   
![Screen_Shot_2016-12-19_at_2.12.34_PM](/uploads/d228c105f90d546fce5b1653d7a74fd7/Screen_Shot_2016-12-19_at_2.12.34_PM.png)

See merge request !8181

Give forbidden if project for the build was deleted

I guess we don't need a change log entry because this is just for an internal corner case fix.

Closes #25309

See merge request !8091

Fix Route#rename_children behavior

## What does this MR do?

Fix Route#rename_children behavior.
Given group `gitlab` and `gitlab-org` exists. When rename `gitlab` it
will rename `gitlab-org` group route too. This MR fixes it

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/2772

See merge request !8182

Even out padding on "plus" button in breadcrumb menu

Changed the padding on the ```+``` button to be ```6px``` on all sides.

![Screen_Shot_2016-12-16_at_8_06_07_PM](/uploads/cc85f8ff36c7d2dd75546a67445af19a/Screen_Shot_2016-12-16_at_8_06_07_PM.png)

Closes #25740

See merge request !8154

Add Wiki import to BB importer

## What does this MR do?

Adds wiki importing



- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/25819

See merge request !8180

Add LDAP maintenance task

I've received quite a few support requests where a user has renamed their LDAP server in the configuration file. This causes lots of issues where users are suddenly unable to sign in. It's easy enough to fix through the Rails console, but each time I had to instruct users how to get to the Rails console and what to type. This Rake task takes care of this and updates from old to new provider automatically.

Example: `sudo gitlab-rake gitlab:ldap:rename_provider[ldapmain,ldapcustom]`

cc/ @patricio @balameb Do you think this is useful?

See merge request !2181

Changed plus button padding to 6px 10px

[ci skip]

[ci skip]

Move Admin Appearance spinach feature to RSpec

Part of #23036

See merge request !8063

Move buttons to project header

Closes #25692    
Before:   
<img src="/uploads/fb65f1ca8021f1669071a3980e5f8258/Screen_Shot_2016-12-14_at_3.52.19_PM.png" width="800px">
After (with Koding setup):   
<img src="/uploads/236e0103186a1b482c4302aa3a4b94b1/Screen_Shot_2016-12-16_at_10.09.53_AM.png" width="800px">
After (without Koding setup):
<img src="/uploads/04bc8360831c98a4c86d3b11ee24826d/Screen_Shot_2016-12-16_at_10.18.35_AM.png" width="800px">


See merge request !8095

Given group `gitlab` and `gitlab-org` exists. When rename `gitlab` it
will rename `gitlab-org` group route too. This commit fixes it
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

[ci skip]

[ci skip]

[ci skip]

[ci skip]

Make CI badge hitboxes better match container

## What does this MR do?

Makes the Pipeline graph badge hitboxes accurately match their containers.
Currently, there's an issue where the badge highlights, as though, it's clickable, but clicking it does nothing:

![before](/uploads/668f841c640bc586044c89bed9f1e1e9/before.gif)

This is due to the `<a>` and `<button>` elements being padded into the parent elements. So, the parent would react to a cursor, but the cursor wouldn't be on the `<a>`/`<button>` yet.

![before-hitbox](/uploads/6ebaaa4be1096fbfc37f8d73da492c7b/before-hitbox.png)

## Are there points in the code the reviewer needs to double check?

Maybe the tests? I kept the style changes as minimal as possible.

## Why was this MR needed?

I was annoyed every time I clicked on a badge that I was _clearly on_ (it highlighted), but nothing happened.
If I found it irritating, perhaps someone else did too.

## Screenshots (if relevant)

How it behaves in the PR:
![finished](/uploads/c26fabe37ccf17f171f40b48522702b2/finished.gif)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #25547 

See merge request !8156

Geo: Improve project view UI to teach users how to clone from a secondary Geo node and push to a primary.

This Merge request adds a new button into the "repository clone widget" to guide Geo (#76) users how to define a different remote URL for pushing code.
We can infer the primary's node URL when using `HTTP` method, but not for `SSH` or `Kerberos` (as they can vary according to configuration defined into config files).

For the `HTTP` method the instruction will be "complete", while for the others there will be a placeholder instead of the primary's node URL for that repository.  (See screenshots below)

Checklist
- [x] Display a button after the clipboard icon only in secondary Geo nodes
- [x] Clicking in the Geo info button, shows up a dialog with instructions
- [x] Instructions use the selected clone mode to display correct text (HTTP/SSH/KERBEROS)

Closes #789

----

![http_clone](/uploads/4e0298faab6ea602aba158e61d7a3d2c/http_clone.png)

![ssh_clone](/uploads/2e9d421de842db0a938c181326522fd2/ssh_clone.png)

See merge request !905

Move admin broadcast messages spinach feature to RSpec

Part of #23036

See merge request !8067