Modify vm_job example

* Sometimes we can't associate IP to VM if
   the VM is on stage 'build' or 'spawning'
 * Added new task - wait_vm_active

Change-Id: I9c71202861717f1e0ee80b171d73e91d790e212c

examples/v2/vm_job/vm_job.yaml

@@ -70,6 +70,18 @@ workflows:
         action: nova.floating_ips_findall instance_id=null
         publish:
           vm_ip: $[0].ip
+        on-success:
+          - wait_vm_active
+        on-error:
+          - send_create_vm_error
+
+      wait_vm_active:
+        description: Waits till VM is ACTIVE.
+        action: nova.servers_find id={$.vm_id} status="ACTIVE"
+        policies:
+          retry:
+            count: 5
+            delay: 10
         on-success:
           - associate_ip
         on-error: