stop puppet-unit 3.3 and 3.4 jobs starting from newton
stop puppet-unit 3.3 and 3.4 jobs starting from newton

Recent poll [1] showed us that a large majority of deployments
are running Puppet 3.8 and only 1/25 deployment ran Puppet 3.4.

This patch stops testing puppet 3.3 and 3.4 starting from Newton, but
will still keep testing for our all stable branches, so we make sure we
don't break them when backporting.

It will help us to move forward with Puppet versions testing, reduce CI
consumption and bring new features that are not supported in Puppet 3.4.

[1] https://goo.gl/JHb7Uc

Change-Id: I2e3e89e0952c58c691ce3bf0059d49fd0284096a

openstack-infra/project-config,openstack-infra/project-config,dongwenjuan/project-config,dongwenjuan/project-config,Tesora/tesora-project-config,Tesora/tesora-project-config