Allow the lock decorator to take a list
Allow the lock decorator to take a list

In the cases where a list of locks is desired
to be acquired it would be nice to use the same
lock decorator to accomplish this.

Change-Id: Ib25329eef330d1b434bc3e8e79d7bb38f450c7ae

openstack/taskflow,pombredanne/taskflow-1,pombredanne/taskflow-1,junneyang/taskflow,openstack/taskflow,junneyang/taskflow,jimbobhickville/taskflow,citrix-openstack-build/taskflow,varunarya10/taskflow,jessicalucci/TaskManagement,jimbobhickville/taskflow,varunarya10/taskflow,jessicalucci/TaskManagement,citrix-openstack-build/taskflow