Fix startup scripts

This commit fixes the startup script for gitlab and adds a call to
remove the socket gitlab uses before trying to start up. It also fixes
the gitlab-start and sidekiq execute blocks to not be user specific
since we are handling this in the command. It also fixes a call to fqdn
and ensures we grab this value from the node. And it also removes the
default nginx site configuration from sites-enabled since we want gitlab
to be the only site that nginx serves by default.
Update init script and default recipe

This commit updates the init script for gitlab service to handle the
gitlab socket when starting and stopping. It also updates the default
recipe to remove some unnecessary node attributes that were commented
out.
Remove string interpolation

This commit removes unnecessary string interpolation from the gitlab
users recipe.
Merge pull request #23 from WideEyeLabs/update-gitlab-service-template

Update gitlab service template