Add support for running GitLab Geo tracking database

Secondary Geo Nodes will need a separate PostgreSQL tracking database to store progress. This MR depends on https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1197.

database_geo.yml.example

@@ -3,11 +3,11 @@ development:
   encoding: unicode
   database: gitlabhq_geo_development
   pool: 5
-  host: /home/git/postgresql
+  host: /home/git/postgresql-geo
 test: &test
   adapter: postgresql
   encoding: unicode
   database: gitlabhq_geo_test
   pool: 5
-  host: /home/git/postgresql
+  host: /home/git/postgresql-geo