Remove sql_ro cruft

files/gitlab-cookbooks/gitlab/libraries/chef_server.rb:      GitLab['postgresql']['sql_ro_password'] ||= generate_hex(50)
files/gitlab-cookbooks/gitlab/libraries/chef_server.rb:                'sql_ro_password' => GitLab['postgresql']['sql_ro_password']
files/gitlab-cookbooks/gitlab/libraries/helper.rb:  def sql_ro_user_exists?
files/gitlab-cookbooks/gitlab/libraries/helper.rb:    user_exists?(node['gitlab']['postgresql']['sql_ro_user'])

mentioned in merge request !17 (merged)

Status changed to closed by commit 5a3db5

mentioned in issue #79 (closed)

mentioned in issue #366 (closed)

mentioned in commit 973aafb4

mentioned in commit a96652b3