Make support scripts rubocop friendly

See merge request !1568

Build Python with libedit

See merge request !1565

Rename geo_backfill worker configuration

See merge request !1548

Enhance documentation of package building internals

Closes #2340

See merge request !1547

Make runit recipes Rubocop friendly

See merge request !1564

Add a missing symlink for /opt/gitlab/init/sshd to make `gitlab-ctl stop` work in Docker

Closes gitlab-ee#2406

See merge request !1556

Registry aws go 1 8 fix

Closes #2350

See merge request !1563

Add the maintainers policy on issue triaging.

Closes #2268

See merge request !1553

Update Matermost configuration options

See merge request !1558

Updating GitLab Mattermost to 3.9 for GitLab 9.2 release

See merge request !1552

Update postgresql_user resource to allow different helpers

Closes #2348

See merge request !1561

This should fix issues with pushing to registries backed by s3 storage

Geo uses it's own subclass of BasePgHelper
* Default to PgHelper, but allow user to provide a helper
* Remove protected status from service_name and service_cmd methods

Rename Trigger schedule to Pipeline Schedule

See merge request !1546

The feature was listed as experimental on the docs page describing this
feature, so we're free to change the key to match the worker name.

The frequency was improved too, so the peaks would be lower, and
accuracy would be better. The default cron pattern was choosen so it
would spread the load between other scheduled jobs nicely.

Adding `bin/compile` to gitlab-shell build steps

Closes #2304

See merge request !1554

Improve `gitlab-ctl replicate-geo-database` error messages

Closes gitlab-ee#2176

See merge request !1557

Users forgetting to run this command as root would not see any
helpful warning messages. Now it will say:

```
* Stopping PostgreSQL and all GitLab services
warning: geo-postgresql: unable to open supervise/ok: access denied
warning: gitaly: unable to open supervise/ok: access denied
warning: gitlab-monitor: unable to open supervise/ok: access denied
warning: gitlab-workhorse: unable to open supervise/ok: access denied
warning: logrotate: unable to open supervise/ok: access denied
warning: nginx: unable to open supervise/ok: access denied
warning: node-exporter: unable to open supervise/ok: access denied
warning: postgres-exporter: unable to open supervise/ok: access denied
warning: postgresql: unable to open supervise/ok: access denied
warning: prometheus: unable to open supervise/ok: access denied
warning: redis: unable to open supervise/ok: access denied
warning: redis-exporter: unable to open supervise/ok: access denied
warning: sidekiq: unable to open supervise/ok: access denied
warning: unicorn: unable to open supervise/ok: access denied

[ERROR] Failed to execute: gitlab-ctl stop -- be sure to run as root
```

Closes gitlab-org/gitlab-ee#2176