Remove *ALL* Authentication Parameters/Handlers from EC2 Templates

[ferricoxide]

Is your feature request related to a problem? Please describe.
Current EC2 template design assumes AD/LDAP-integration. Removing that assumption from template will both decrease the number of parameters to pass and allow for deployment to non-AD/LDAP environments.

Describe the solution you'd like
Remove all authentication references from EC2 templates — instead placing them in the site-local gitlab.rb.tmplt file

Notes
Currently only present in the yet-to-be updated make_gitlab_parent-GlusterFS.tmplt.json file.