Add healthcheck to the frr image
Add healthcheck to the frr image

We could not do that in the initial review because CI runs its
tests on a non-rebuild rpm. See:
https://review.opendev.org/c/openstack/tripleo-common/+/763087/6..11

So we add it now that the initial image has already been added.

Change-Id: Ifee9d90f30c4ad4a401149b979f220d8028d2643

openstack/tripleo-common,openstack/tripleo-common