Pin puppet-stdlib to 4.16.0
Pin puppet-stdlib to 4.16.0

stdlib 4.17.0 introduced some puppet 4.6+ specific functionality and we
run tests under 4.5 which fail. This change pins stdlib to 4.16.0 just
for tests.

Change-Id: I9e673f655a9fe4186c737409a7e20d3c2752b606

openstack/puppet-pacemaker,openstack/puppet-pacemaker,openstack/puppet-pacemaker,openstack/puppet-pacemaker