Cookbook support changing user in gitlab.yml
requested to merge michaelfenn87/omnibus-gitlab:cookbook-support-changing-user-in-gitlab.yml into master
The cookbooks will let you change the git user by setting user['username'] = "gitlab" in gitlab.rb, but they don't also change the username in gitlab.yml. This commit makes sure those are in sync, while giving the admin the ability to have them differ if they want.