test/common: exit with error in waitforlisten() if app crashed

In some cases, if vhost crashes on startup, test would continue
normally instead of failing

Change-Id: If2f82b5e3dad07403051353d6fcf5e83d5d002c0
Signed-off-by: Pawel Niedzwiecki <pawelx.niedzwiecki@intel.com>
Reviewed-on: https://review.gerrithub.io/403064
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>

test/common/autotest_common.sh

@@ -212,7 +212,7 @@ function waitforlisten() {
 		# if the process is no longer running, then exit the script
 		#  since it means the application crashed
 		if ! kill -s 0 $1; then
-			exit
+			exit 1
 		fi
 		if netstat -an -x | grep -iw LISTENING | grep -q $rpc_addr; then
 			ret=0