standardize a few things in admins.pp for conversion

absent => 'absent'
present => 'present'

multiple keys =>

    keys:
      one:
        1;
      two:
        2;

This is by no means perfect but I am doing it mainly
to have a sane starting place for conversion.

Change-Id: I8669ceeb87d4b085581bbd8a85cc96229b171de6