Merge remote-tracking branch 'gitlab-ce/5029-support-cluster-metrics-ce' into 5029-support-cluster-metrics

# Conflicts:
#	app/controllers/projects/prometheus/metrics_controller.rb
#	app/controllers/projects/prometheus_controller.rb
#	app/models/environment.rb
#	config/gitlab.yml.example
#	config/sidekiq_queues.yml
#	db/schema.rb
#	spec/controllers/projects/prometheus/metrics_controller_spec.rb
#	spec/models/environment_spec.rb
#	spec/models/project_services/prometheus_service_spec.rb

Ee blob webpack bundle remove tags

See merge request gitlab-org/gitlab-ee!4716

Enable labels for epics

See merge request gitlab-org/gitlab-ee!4569

Merged CE boards-bundle-refactor into EE

See merge request gitlab-org/gitlab-ee!4670

Fix multiple assignees avatar alignment in issues list

Closes #5013

See merge request gitlab-org/gitlab-ee!4664

commit 637c9558
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Mon Feb 26 12:40:40 2018 +0100

    Fix failing test, when deployment platform is not bound to a cluster.

commit 0feeddaa
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Sat Feb 24 01:06:08 2018 +0100

    drop the ! from synchronize_service_state! + remove unused scope

commit 22e2cad9
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Sat Feb 24 00:56:50 2018 +0100

    Use deployment platform to find cluster with prometheus application

[EE] Resolve "Refactoring of blob link methods in blob_helper"

See merge request gitlab-org/gitlab-ee!4722

[EE] Extract WaitableWorker out of AuthorizedProjectsWorker

See merge request gitlab-org/gitlab-ee!4723

Port of pages custom domain DNS verification to EE

See merge request gitlab-org/gitlab-ee!4691

CE upstream - 2018-02-23 15:23 UTC

See merge request gitlab-org/gitlab-ee!4696

Fix bug causing 'Import in progress' to be shown while a mirror is updating

See merge request gitlab-org/gitlab-ee!4697

[EE] Don't convert issuable_initial_data into JSON

See merge request gitlab-org/gitlab-ee!4694

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

IDE create new branch

Closes #4545

See merge request gitlab-org/gitlab-ee!4534

[EE] Verify project import status again before marking as failed

See merge request gitlab-org/gitlab-ee!4698

Instead of converting hash into JSON inside
issuable_initial_data method, return hash and convert
to JSON later. This allows us to easily extend basic
issuable data with resource specific values. For example
for Epic these data should include also labels, so we can then
do something like:
issuable_initial_data(@epic).merge(labels: @epic.labels).to_json

[ci skip]

[ci skip]

QA specs for merge request rebasing and squashing

Closes gitlab-qa#78

See merge request gitlab-org/gitlab-ee!4288