Adds the following new Zuul job for testing deployment of Monasca and
associated services:
* kolla-ansible-centos8-source-monasca
All core OpenStack services except for Keystone are disabled to ensure
enough memory is available.
A follow up patch will replace the basic tests here with Tempest.
Co-Authored-By: Doug Szumski <doug@stackhpc.com>
Change-Id: I5d33fd3d7b69798ba0aa23509f7b809065f61c19