* master: (242 commits)
Validate user namespace before saving so that errors persist on model
Reset Project's column information in spec/lib/gitlab/background_migration/populate_merge_request_metrics_with_events_data_spec.rb
Explicitly set cwd in Sidekiq memory killer instead of depending on getcwd
Downgrade google-protobuf
Close low level rugged repository in project cache worker
File upload UI obeys LFS filters
Resolve "Add a link to documentation on how to get external ip in the Kubernetes cluster details page"
Upgrade GitLab Workhorse to v3.6.0
Add sorting options for /users API (admin only)
improvements from feedback
[ci-skip] add changelog
remove file after `Upload#destroy`
Fix a hardcoded pipeline ID in a spinach step
Override group sidebar links
Replace "cluster" with "Kubernetes cluster"
Reorder async/sync tasks in BuildFinishedWorker to read traces efficiently
Fix tests for Drop filename enforcement
Revert using expand_fixture_path in factory
Revert "Add FixtureHelpers for FactoryGirl"
Refactor :trace to :trace_live in spec
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