Remove PE requirement from metadata.json
Remove PE requirement from metadata.json

The PE requirement in metadata.json is not
supported anymore and puppet-lint will throw:

The 'pe' requirement is no longer supported by the Forge.

Change-Id: I6cc8dd98ab9ae774c7429afda95fa7de84871c2c

openstack/puppet-ceph,stackforge/puppet-ceph,openstack/puppet-ceph