Kill neutron-rootwrap-daemon when stop neutron service

Neutron-rootwrap-daemon cannot be killed when you stop
neutron services, so here we add the right command in
the neutron stop-service scripts.

Change-Id: I91fefb277427e0e16ff59760b7255e4c7eee1792
Closes-Bug: #1525601
diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index 6af44e6..47fa650 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -780,6 +780,10 @@
     if is_service_enabled q-metering; then
         neutron_metering_stop
     fi
+
+    if [[ "$Q_USE_ROOTWRAP_DAEMON" == "True" ]]; then
+        sudo pkill -9 -f $NEUTRON_ROOTWRAP-daemon || :
+    fi
 }
 
 # stop_neutron() - Stop running processes (non-screen)