Implement Timetracking v1.1


- [x] Break issuable_time_tracking component into smaller components and bundle them
- [x]  Improve the help state UX to look like this: https://gitlab.com/gitlab-org/gitlab-ee/issues/985#note_16056031
- [x] Create helpers for props existence checking  https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/870#note_18534273
- [x] Standardize on camelCase where possible, improve naming with computed values
- [x] Be clear about using human values from the server vs client 
- [x] Address the accessibility impact of only displaying the remaining time in a tooltip and the percentage of time spent in a colored meter.
- [x] Fix help 'Learn more' URL
- [x] Remove polling until the rest of the sidebar can be synced properly

cc: @jschatz1 

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/1263

See merge request !901

EE: Resolve "Add a doorkeeper scope suitable for authentication"

- EE counterpart for gitlab-org/gitlab-ce!5951
- Related to gitlab-org/gitlab-ce#20492

See merge request !946

Fix reconfigure link on doc/pages/administration.md

The link had an extra `../` in it and wasn't working on https://docs.gitlab.com/ee/pages/administration.html#nginx-configuration

See merge request !967

The CE merge request renamed the `Oauth2::AccessTokenValidationService` and
converted it from a module to a class. There are two invocations of this
module/class that are EE-only, which needed to be updated.

If we leave this as a regular migration, we could have the following flow:

1. Application knows nothing about scopes.
2. First migration runs, all existing personal access tokens have `api` scope
3. Application still knows nothing about scopes.
4. Second migration runs, all tokens created after this point have no scope
5. Application still knows nothing about scopes.
6. Tokens created at this time _should have the API scope, but instead have no scope_
7. Application code is reloaded, application knows about scopes
8. Tokens created after this point only have no scope if the user deliberately
   chooses to have no scopes.

Point #6 is the problem here. To avoid this, we move the second migration to a
"post" migration, which runs after the application code is deployed/reloaded.

`valid_api_token?` is a better name. Scopes are just (potentially) one facet of
a "valid" token.

- Previously, AccessTokenValidationService was a module, and all its  public
methods accepted a token. It makes sense to convert it to a class which accepts
a token during initialization.

- Also rename the `sufficient_scope?` method to `include_any_scope?`

- Based on feedback from @rymai

- The `scopes_form` partial can be used in the `admin/applications` view
  as well

- Don't allow partials to access instance variables directly. Instead, pass
  in the instance variables as local variables, and use `local_assigns.fetch`
  to assert that the variables are passed in as expected.

- Change a few instances of `render :partial` to `render`

- Remove an instance of `required: false` in a view, since this is the default

- Inline many instances of a local variable (`ip = 'ip'`) in `auth_spec`

Split the existing feature spec into both feature and controller specs.
Feature specs assert on browser DOM, and controller specs assert on database
state.

- Use whitespace to separate the setup, expectation and teardown phases.

- Based on @dbalexandre's review
- Extract token validity conditions into two separate methods, for
  personal access tokens and OAuth tokens.

- The list of scopes that's displayed while creating a personal access
  token is identical to the list that's displayed while creating an OAuth
  application. Extract these into a partial.

- The list of scopes that's displayed while in the show page for an OAuth token
  in the profile settings and admin settings are identical. Extract these into
  a partial.

- Mainly whitespace changes.

- Require the migration adding the `scope` column to the
  `personal_access_tokens` table to have downtime, since API calls will
  fail if the new code is in place, but the migration hasn't run.

- Minor refactoring - load `@scopes` in a `before_action`, since we're
  doing it in three different places.

- This module is used for git-over-http, as well as JWT.

- The only valid scope here is `api`, currently.

- Move the `Oauth2::AccessTokenValidationService` class to
  `AccessTokenValidationService`, since it is now being used for
  personal access token validation as well.

- Each API endpoint declares the scopes it accepts (if any). Currently,
  the top level API module declares the `api` scope, and the `Users` API
  module declares the `read_user` scope (for GET requests).

- Move the `find_user_by_private_token` from the API `Helpers` module to
  the `APIGuard` module, to avoid littering `Helpers` with more
  auth-related methods to support `find_user_by_private_token`

The issue was arising when `#current_user` was called a second time
after a user was impersonated: the `User#is_admin?` check would be
performed on it and it would fail.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Adds hoverstates for collapsed Issue/Merge Request sidebar for Time tracking Icon

This MR is part 2/2 of https://gitlab.com/gitlab-org/gitlab-ce/issues/25011

This adds the hover state for the time tracking icon, which is only in EE.

![2016-11-28_00.09.54](/uploads/a1ae70e10ad847c4980fa9eca3dcfe18/2016-11-28_00.09.54.gif)

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/25011

See merge request !918

Add user activities API

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/1311

See merge request !962