Switch Puppet 6 jobs to non-voting
Switch Puppet 6 jobs to non-voting

The Puppet OpenStack jobs have added a unit test job for puppet 6.0 but
puppet-tripleo is not ready. This change defines our own job templates
to switch the 6.0 and latest jobs to non-voting.

Change-Id: I82c02bf50f18d5953ba0ced48bcf9aa859739f42

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo