Resolve "Correct docs for external CI/CD repositories now have container registry"

Closes #5672

See merge request gitlab-org/gitlab-ee!5370

Don't reset application settings import sources

See merge request gitlab-org/gitlab-ee!5362

CE upstream - 2018-04-13 09:32 UTC

See merge request gitlab-org/gitlab-ee!5359

There are 2 problems with this spec:

1. It checks for default visiblity level however there is not code in
controller to handle such default. Same check can be performed on model
directly.
2. It passes empty application_setting hash while controller requires
application_setting not to be empty by using `require` with `permit`
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Geo - Improve the query performance to find unsynced job artifacts

See merge request gitlab-org/gitlab-ee!5350

Remove duplicate section in auto-devops documentation

See merge request gitlab-org/gitlab-ee!5366

Add Epic count to usage pings

Closes #5256

See merge request gitlab-org/gitlab-ee!5307

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Geo: Fix enabled wiki counts with FDW enabled (impacts synced, out-of-sync, and verified wiki counts)

Closes #5361

See merge request gitlab-org/gitlab-ee!5352

Geo: Fix enabled wiki counts with FDW enabled (impacts synced, out-of-sync, and verified wiki counts)

Port from CE: Replacing gollum libs for custom gitlab ones

See merge request gitlab-org/gitlab-ee!5344

If form does not have import sources checkboxes we should not reset
import sources to empty. This fixes issue when import sources got reset
after user modifies unrelated settings section like GitLab pages
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Resolve "Geo: High number of sequential scans in project_repository_states"

Closes #5513

See merge request gitlab-org/gitlab-ee!5348

Fixed IDE sidebar not being scrollable in FireFox

Closes #45314

See merge request gitlab-org/gitlab-ce!18350

Changes the ID for the performance bar to correctly sticky the stat bar to the top

See merge request gitlab-org/gitlab-ce!18359

CE upstream - 2018-04-12 21:23 UTC

See merge request gitlab-org/gitlab-ee!5349

Don't use "-f" with "rm" in Gitlab-Basics Docs

Closes #20071

See merge request gitlab-org/gitlab-ce!18027

Deprecate legacy disk paths

See merge request gitlab-org/gitlab-ce!18332

Feature/add language in repository to api

See merge request gitlab-org/gitlab-ce!17770

Add missing documentation about failure reason

Closes #45300

See merge request gitlab-org/gitlab-ce!18352

Fix reference filters in group context

See merge request gitlab-org/gitlab-ce!18340

[EE] Fix reference filters in group context

Closes #5631

See merge request gitlab-org/gitlab-ee!5339

Resolve "Weird "joined" information on project members page"

Closes #30739

See merge request gitlab-org/gitlab-ce!18290

This forces the query to use the appropriated indexes instead of
sequential scans in project_repository_states table.

CE upstream - 2018-04-12 18:23 UTC

Closes #5103

See merge request gitlab-org/gitlab-ee!5347

Correct wrong buildpacks filename

See merge request gitlab-org/gitlab-ce!18336