CE upstream - 2018-03-08 00:26 UTC

Closes gitaly#1057

See merge request gitlab-org/gitlab-ee!4891

Resolved using the master version. Since I believe the conflicts just
originated from a backport.

(EE-Port) Allow maintainers to push forks of a project for branches that have open MRs

See merge request gitlab-org/gitlab-ee!4885

Since now we're setting the auhtor in the `MergeRequest::BuildService`

We now need to check if the user does not have access to the pipeline
through a merge request that allows maintainer access

When a project is not private, and the source branch not protected the
user can now select the option to allow maintainers to push to this
branch.

This flag will allow maintainers of a project to push to specific
branches of a fork of a project

Custom Metrics backend and UI for creating and editing queries

See merge request gitlab-org/gitlab-ee!3799

Geo - Repository verification on secondary node

See merge request gitlab-org/gitlab-ee!4749

Fix failure in ee/spec/services/ci_cd/github_setup_service_spec.rb

See merge request gitlab-org/gitlab-ee!4890

# Conflicts:
#	Gemfile.lock
#	app/models/members/project_member.rb
#	app/views/import/github/new.html.haml
#	db/schema.rb
#	doc/api/merge_requests.md
#	locale/gitlab.pot
#	spec/policies/project_policy_spec.rb

[ci skip]

Don't delete todos or unassign issues and MRs when a user leaves a project

Closes #43899

See merge request gitlab-org/gitlab-ce!17615

[EE] Don't delete todos or unassign issues and MRs when a user leaves a project

See merge request gitlab-org/gitlab-ee!4889

Port changes from EE: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4885 (Maintainer push to fork)

See merge request gitlab-org/gitlab-ce!17629

Geo - Calculate repositories checksum on primary node

Closes #4756

See merge request gitlab-org/gitlab-ee!4428

CI/CD only GitHub import sets up service integrations

Closes #4721

See merge request gitlab-org/gitlab-ee!4687

backport of custom metrics for the common metrics section of CE

See merge request gitlab-org/gitlab-ce!17586