The configure step for the DRAgent tests configures a name for a
floating IP to be checked for at the peer side. Since the data plane
tests add one as well for an instance, make sure the control plane-only
tests rely on the FIP that has a specific name. This can be useful if
the tests are run in a different order.
A charm that uses FRR instead of Quagga is now published under:
https://charmhub.io/osci-frr
For our purposes FRR is a drop-in replacement of Quagga but the point
of a change is to remove Quagga references for clarity.