Add action APIs.
Keep working on senlin engine items:
 - increase runAction and wait function in senlin scheduler;
 - do_create/do_update method of Cluster will create a node
   object before creating a nodeAction;

TODO:
 - Make a basic implementation for scheduler.runAction and
   scheduler.wait using python threading.
 - Replace python threading with  oslo.cocurrentcy
Revised password
Merge branch 'master' of 9.186.106.172:/opt/git/senlin