Add  tripleo-undercloud job
Add  tripleo-undercloud job

TripleO uses ironic + networking-baremetal in undercloud while it does
not use ironic in overcloud. This change adds tripleo-undercloud so
that code specific to networking-baremetal is tested.

Change-Id: Ie8e668e4660228d0aa9798f894ffa6a7826850ea

openstack/puppet-neutron,openstack/puppet-neutron