Pin puppet-python to v5.0.0
Pin puppet-python to v5.0.0

... until we fix the compatibility issue in puppet-monasca.

Related-Bug: #1930553
Change-Id: I473c0956950d3a53e724f1764ed87ad075c44124

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration