Add optional db_name to `gitlab-ctl replicate-geo-database`
Adds optional db_name to gitlab-ctl replicate-geo-database
.
Defaults to gitlabhq_production
(backwards-compatible).
For https://gitlab.com/gitlab-org/gitlab-ee/issues/9123:
Don't hard-code gitlab-ctl replicate
DB name togitlabhq_...
.