packaging: setup: update firewall for all services

Update the firewall for websocket_proxy and postgresql not only during
setup.

Always ask whether to update the firewall and do not keep the answer
in the postinstall answer file, to allow users to keep their manual
changes on upgrades.

Output manual configuration instructions only for supported firewall
managers.

Bug-Url: https://bugzilla.redhat.com/1024707
Bug-Url: https://bugzilla.redhat.com/1029020
Bug-Url: https://bugzilla.redhat.com/1023316
Change-Id: If3c1a634b2e8539ebd604205b5487290c8d8a1a9
Signed-off-by: Yedidyah Bar David <didi@redhat.com>
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>