kill test watcher when tests end by themself
kill test watcher when tests end by themself

Change-Id: Icd31bf06dc02d58a53d1813b0f114e78ccfd5c87
Signed-off-by: Alessandro Salvatori <8a0c874bf01335702b42d6983c4d9b3eb550c634@gmail.com>

opendaylight/opflex,mhrobinson/opflex,mhrobinson/opflex,opendaylight/opflex,opendaylight/opflex,mhrobinson/opflex,mhrobinson/opflex,opendaylight/opflex