Add back support for Puppet 5.x
Add back support for Puppet 5.x

This module follows the independent release model and should be
compatible with the current open branches (stable/train to master).

Because stable/train supports only Puppet 5.x, this modules should
support that old version as well.

Change-Id: I8bd53ee9c07263e29baad5d180c6a601c26034d5

openstack/puppet-ceph,openstack/puppet-ceph