cephadm: still try to open ports in firewall on redeploy/reconfig

cephadm: still try to open ports in firewall on redeploy/reconfig

Prior to this patch we were discarding the provided
ports on reconfig and redeploy in order to not fail
thinking there was a port conflict with the instance
of the daemon we were about to reconfig/redeploy. However,
it's still desirable for us to make sure the firewall ports
are open when we do a reconfig/redpeloy, so this refactors
the port handling approach to have it do that but
still avoid checking for port conflicts. It also include
an update of the type signature of deploy_daemon
to the py3 style. That wasn't needed for the change
but since I was added an arugment there I thought we might
as well do it now.

Signed-off-by: Adam King <adking@redhat.com>