Return changes on successful lxc.create from salt-cloud

Otherwise user is not able to find if LXC container was created when
using cloud.profile state. No changes were reported and output was
always showing container as already existing and not created because of
state applied.

salt/cloud/clouds/lxc.py

@@ -426,6 +426,8 @@ def create(vm_, call=None):
     ret['result'] = cret['result']
     if not ret['result']:
         ret['Error'] = 'Error while creating {0},'.format(vm_['name'])
+    else:
+        ret['changes']['created'] = 'created'
     return ret