Drop amulet tests and create bundles for all target
Ubuntu/OpenStack series combinations inline with
current best practice.
Zaza tests are not a direct translation from the Amulet tests;
the new tests focus in Ceph RADOS Gateway and integration with
keystone rather than deploying compute, image and block
services (which do not make use of the ceph-radosgw charm).
Change-Id: I41914df024eb02e5a555bc0e44993e09d310933e
2eef15113f