Modify cassandra deployment strategy
Modify cassandra deployment strategy

Change-Id: I5573516e4218b3411e1d666ec18bc6723cadf74e

obulpathi/poppy,obulpathi/poppy,openstack/poppy,openstack/poppy,obulpathi/poppy,stackforge/poppy,openstack/poppy,stackforge/poppy,stackforge/poppy