Fix handlers in database and cinder-volume

For some reason, ansible restart services failed.
Changing the handlers to shell commands fixed it.

Change-Id: Icae30130b6318d68d919596a2fe9b1222258e503

ansible/roles/cinder-volume/handlers/main.yml

@@ -3,4 +3,4 @@
   service: name=cinder-volume state=restarted
 
 - name: restart tgt
-  service: name=tgt state=restarted
+  shell: service tgt restart

ansible/roles/database/handlers/main.yml

@@ -1,3 +1,3 @@
 ---
 - name: restart mysql
-  service: name=mysql state=restarted
+  shell: service mysql restart