We would like to remove the --*-scale options from the cli so we need to
be able to configure the Overcloud<role>Count options instead. This
change switches from using topology to topology_map to express the
topology configuration.
Change-Id: Ifff664d8f75bd29fa764ef0cdf780627f648e689
Depends-On: https://review.openstack.org/#/c/648562/