Implement screen process stop() function

Implements screen process stop in ceilometer, cinder, glance, heat, n-vol

Change-Id: Ic5e02926f026d0e6f4b39846bfe77634dd414c60
diff --git a/lib/n-vol b/lib/n-vol
index cc669cb..db53582 100644
--- a/lib/n-vol
+++ b/lib/n-vol
@@ -114,9 +114,10 @@
     screen_it n-vol "cd $NOVA_DIR && $NOVA_BIN_DIR/nova-volume"
 }
 
-# stop_nvol() - Stop running processes (non-screen)
+# stop_nvol() - Stop running processes
 function stop_nvol() {
-    # FIXME(dtroyer): stop only the n-vol screen window?
+    # Kill the nova volume screen window
+    screen -S $SCREEN_NAME -p n-vol -X kill
 
     stop_service tgt
 }