tweaking the extra packages. Make sure our experimental mellanox repo is disabled. Clean the cache before installation (as disks may fill up)

  1) attempts in nfs-client to notify two handlers at once (this didn't work)
  2) attempts to mount a file system twice (I don't know why we included this in the first place, mounts should work first time)
  3) checks using mountpoint -q (this a) didn't work when updating a mount b) only checked the first mount)

allow us to make a filesystem on an ephemeral disk as well as using a cinder volume supplied with ansible metadata

on the sudoers config
remove some other repos that shouldn't be there

see  https://bugzilla.redhat.com/show_bug.cgi?id=1178720
I have split enable and start commands for redhat

diit for ansible_host_key_rsa_public.
Removed superflous check "and hostvars[node]['ansible_host_key_rsa_public'] "