Default gitlab-psql(-geo) commands to use known database

Fix `could not change directory to "/root": Permission denied`

config/software/gitlab-geo-psql.rb

@@ -54,7 +54,7 @@ else
   privilege_drop="-u ${psql_user}"
 fi
-exec /opt/gitlab/embedded/bin/chpst ${privilege_drop} -U ${psql_user} /opt/gitlab/embedded/bin/psql -p ${psql_port} -h ${psql_host} "$@"
+cd /tmp; exec /opt/gitlab/embedded/bin/chpst ${privilege_drop} -U ${psql_user} /opt/gitlab/embedded/bin/psql -p ${psql_port} -h ${psql_host} -d ${psql_dbname} "$@"
        EOH
     end
   end

config/software/gitlab-psql.rb

@@ -54,7 +54,7 @@ else
   privilege_drop="-u ${psql_user}"
 fi
-exec /opt/gitlab/embedded/bin/chpst ${privilege_drop} -U ${psql_user} /opt/gitlab/embedded/bin/psql -p ${psql_port} -h ${psql_host} "$@"
+cd /tmp; exec /opt/gitlab/embedded/bin/chpst ${privilege_drop} -U ${psql_user} /opt/gitlab/embedded/bin/psql -p ${psql_port} -h ${psql_host} -d ${psql_dbname} "$@"
        EOH
     end
   end

doc/maintenance/README.md

@@ -101,15 +101,6 @@ least once. The `gitlab-psql` command cannot be used to connect to a
 remote Postgres server, nor to connect to a local non-Omnibus Postgres
 server.
-If you start gitlab-psql from a directory that is not world-readable
-(like /root) then `psql` will print a warning message:
-
-```
-could not change directory to "/root"
-```
-
-This is normal behavior and it can be ignored.
-
 #### Starting a Postgres superuser psql session in Geo tracking database
 Similar to the previous command, if you need superuser access to the bundled

files/gitlab-cookbooks/gitlab-ee/templates/default/gitlab-geo-psql-rc.erb

 psql_user='<%= node['gitlab']['postgresql']['username'] %>'
 psql_host='<%= node['gitlab']['geo-postgresql']['unix_socket_directory'] %>'
 psql_port='<%= node['gitlab']['geo-postgresql']['port'] %>'
+psql_dbname='<%= node['gitlab']['geo-secondary']['db_database'] %>'

files/gitlab-cookbooks/postgresql/templates/default/gitlab-psql-rc.erb

 psql_user='<%= node['gitlab']['postgresql']['username'] %>'
 psql_host='<%= node['gitlab']['postgresql']['unix_socket_directory'] %>'
 psql_port='<%= node['gitlab']['postgresql']['port'] %>'
+psql_dbname='<%= node['gitlab']['gitlab-rails']['db_database'] %>'