Implement start_node and stop_node for DO, to be consistent among providers
Implement start_node and stop_node for DO, to be consistent among providers

mistio/libcloud,andrewsomething/libcloud,apache/libcloud,Kami/libcloud,mistio/libcloud,apache/libcloud,andrewsomething/libcloud,Kami/libcloud,mistio/libcloud,andrewsomething/libcloud,Kami/libcloud,apache/libcloud