Use SIGTERM signal to stop Netflix

We need to save cookies on DIAL exit in order to pass the
test DPI-179-TC1 Persistent Cookies

Change-Id: Id76db62ac2f0ecaecfcfa3e934553f48999cee11
diff --git a/src/server/main.c b/src/server/main.c
index 3a8afbd..bd881c1 100644
--- a/src/server/main.c
+++ b/src/server/main.c
@@ -345,7 +345,7 @@
     if( pid )
     {
         printf("Killing pid %d\n", pid);
-        kill((pid_t)pid, SIGKILL);
+        kill((pid_t)pid, SIGTERM);
         waitpid((pid_t)pid, NULL, 0); // reap child
     }
 }