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

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

files/gitlab-ctl-commands-ee/replicate_geo_database.rb

@@ -162,8 +162,9 @@ class ReplicateGeoHelpers
   def run_command(cmd, live: false)
     status = GitlabCtl::Util.run_command(cmd, live: live)
     if status.error?
+      puts status.stdout
       puts status.stderr
-      puts "[ERROR] Failed to execute: #{cmd}".color(:red)
+      puts "[ERROR] Failed to execute: #{cmd} -- be sure to run this command as root".color(:red)
       puts
       exit 1
     end