Broke out mirror making to own role for flexibility.
Mirror packages installed by its own role
Broke out nginx to its own role to.
Moved nginx conf files to nginx role
Created handler dir
Handlers in playbook
Ansible installed in mirrors module since it is only needed when workers behind private network
Move mirror files, hadnt done yet
Munge key made before slurm install
Stripping preparation role even more
Renamed master_preparation role