Include Merge description message in merge by default. User can disable description in merge message by clicking on `Don't include description in commit message`.

Drop the merge title which is "Merge branch SOURCE into TARGET" and only keep the MR title as commit message.

From gitlab 8.12 there is new CI job permissions model which only accept login
from ci token for running job. Then the access is revoked after the job is finished.
In Nexedi, when have a lot of URLs which rely on gitlab-ci-token and project-runners-token, so
we need to re-allow access else access to all those URL will be refused.

More info are here: https://docs.gitlab.com/ee/user/project/new_ci_build_permissions_model.html#before-gitlab-8-12

TODO detect whether request comes from China and only then show ICP (?).

We show in small font size the same info that is shown on sign_in page:

    "GitLab Nexedi Edition", "About GitLab" and "About Nexedi"

This is good to have and hereby-introduced about-footer area will be
also used in the next patch for ICP too.

XXX placement of .about-footer to be near bottom is done not very
correctly.

The default was switched to HTTP in the previous patch, but let's completely
remove SSH option - we support only HTTP for git fetch/push.

Conflicts:
	app/views/shared/_clone_panel.html.haml

Both fetch and push are possible over https, which is selected by http if
gitlab was configured to use https in external url.

This way to reduce security vectors and possible ways to interact with gitlab
we use https only without ssh at all.

= GitLab Community Edition + Nexedi patches

[ci skip]

(backport) Include X-Content-Type-Options (XCTO) header into API responses

See merge request gitlab/gitlabhq!2216

(cherry picked from commit 5fcb214f8527b3d58be1a833a596d01b1bf6119e)

40c6c9f4 Include X-Content-Type-Options (XCTO) header into API responses

eplace SSRF resolver with Addrinfo.getaddrinfo to include alternative localhost versions (9-5)

See merge request gitlab/gitlabhq!2221

(cherry picked from commit 53cc25eb3d45c782b5085524a8976f034ef18781)

96555882 Replace SSRF resolver with Addrinfo.getaddrinfo to include alternative localhost versions

[ci skip]

3435 backport for 9.5

See merge request gitlab/gitlabhq!2207

fix transient user_edits_files_spec failures

See merge request gitlab-org/gitlab-ce!14324

[10.0 CE] Prevent "Related Issues" from leaking confidential issues

See merge request gitlab/gitlabhq!2193

Move project repositories between namespaces when renaming users (9.5)

See merge request gitlab/gitlabhq!2202

Escape user name in filtered search bar

See merge request gitlab/gitlabhq!2195

[9.5] Prevent a persistent XSS in user-provided markup

See merge request gitlab/gitlabhq!2203

Treat newlines as separators for pipeline emails service

Closes #37759

See merge request gitlab-org/gitlab-ce!14250

Fix arbitrary redirect location vulnerability

See merge request gitlab/gitlabhq!2192

Fix arbitrary redirect location vulnerability

See merge request gitlab/gitlabhq!2192

[ci skip]

Fix fork button being disabled for users who can fork to group

Closes #38462

See merge request gitlab-org/gitlab-ce!14551

[ci skip]

Fix gitlab rake:import:repos task for 9.5.x

See merge request gitlab-org/gitlab-ce!14639

This backports !14597 for the 9.5.x branch.

Because of a change in GitLab 9.5.4 to prevent users from assuming control of
a repository already on disk, the import task broke. Imports would fail with
the message, "There is already a repository with that name on disk".

This change skips the validation when the import is done from the
command-line.

Closes #37682

[ci skip]

Handle error when fetching ref for MR with deleted source branch

See merge request gitlab-org/gitlab-ce!14550

Upgrade Nokogiri because of CVE-2017-9050

See merge request gitlab-org/gitlab-ce!14427