protocol_detection: reuse address so that VDSM doesn't have to wait after a crash

Change-Id: Ic10149c619ce7441a1b9eb62bc6806ec997c579c
Signed-off-by: Saggi Mizrahi <smizrahi@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/28740
Reviewed-by: Piotr Kliczewski <piotr.kliczewski@gmail.com>
Tested-by: Yeela Kaplan <ykaplan@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>