[centos] group(s) not present error

[noelmcloughlin]

The default init state does not work on CentOS7

[ERROR   ] The following group(s) are not present: www-data
local:
----------
          ID: aegir_user
    Function: user.present
        Name: aegir
      Result: False
     Comment: The following group(s) are not present: www-data
     Started: 08:14:16.511791
    Duration: 6.784 ms
     Changes:
----------
          ID: aegir_homedir
    Function: file.directory
        Name: /var/aegir
      Result: False
     Comment: One or more requisite failed: aegir.user.aegir_user