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

Re-apply workaround for Kubernetes 1.6 auth

Closes #2343

See merge request !1550

https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2333

Add Postgres exporter queries configuration file

See merge request !1545

Re-apply workaround that got lost in https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1481

Get deb package using CI API to decrease triggered docker image size

Closes #2320

See merge request !1537

Make gitlab-ee recipes rubocop-friendly

See merge request !1486

Allow setting `usage_ping_enabled` in `gitlab.rb`

See merge request !1543

This setting is passed through to the Rails app, and defaults to true. Setting
it to false:

1. Disables the usage ping.
2. Prevents the usage ping from being enabled through the admin panel. It can
   only be enabled by either removing the line from `gitlab.rb` and configuring
   through the admin panel, or setting it to true in `gitlab.rb`.

Adding pgbouncer as EE specific dependency

See merge request !1345

Add an overview of package with bundled dependencies.

Closes #2201

See merge request !1476

Specify image tag explicitly for triggered builds

Closes #2330

See merge request !1540

Add external database config to gitlab-monitor

Closes #2288

See merge request !1529

Merge branch '2329-pg-insufficientprivilege-error-when-starting-gitlab-build-failed-15823054' into 'master'

Removing unless clause on postgresql extension enabling

Closes #2329 and #2302

See merge request !1538

Refactor Prometheus config generator

See merge request !1467

Add a link out to our kubernetes helm docs

See merge request !1541

Create a manual trigger to build package from .com repo also

Closes #2330

See merge request !1539

Use a YAML generator instead of a hand-crafted Chef template.
* Avoids invalid YAML syntax.
* Allows exporter recipes to self-register their scrape configs.
* Allows for easier extensions to the existing configs.
* Minor hack to avoid Chef's attribute magic[0].

[0]: https://tickets.opscode.com/browse/CHEF-3953

This reverts merge request !1527