Revise devstack README.rst with new git repo
Revise devstack README.rst with new git repo

Revised devstack/README.rst file with new git repo URI.

Change-Id: I635461177a98d3448b7b868477fa85afdc86ab98

tengqm/senlin-container,openstack/senlin,openstack/senlin,stackforge/senlin,tengqm/senlin-container,stackforge/senlin,openstack/senlin,Alzon/senlin,Alzon/senlin