packaging: setup: rollback legacy sysconfig

Rolling back also /etc/sysconfig/ovirt-engine on cleanup
after failure.

Change-Id: Ie9e4a90a7e0e47aeb88a938fedb4f2088d533a70
Bug-Url: https://bugzilla.redhat.com/1049622
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>