[CI] issue: 4684071 Terminate Valgrind gracefully

Valgrind today is being terminated with -9 which prevents it from
printing all the summaries at the end which are needed for debuging.

Change -9 signal to -SIGINT af the first try of shutting down Valgrind

Signed-off-by: NirWolfer <nwolfer@nvidia.com>

Author: NirWolfer

contrib/jenkins_tests/vg.sh

@@ -95,7 +95,7 @@ for test_link in $test_ip_list; do
 
 		if [ `ps -ef | grep $test_app | wc -l` -gt 1 ];
 		then
-			${sudo_cmd} pkill -9 -f $test_app 2>/dev/null || true
+			${sudo_cmd} pkill -SIGINT -f $test_app 2>/dev/null || true
 			sleep 10
 			# in case SIGINT didn't work
 			if [ `ps -ef | grep $test_app | wc -l` -gt 1 ];