Fix the repository URL in the README file
Fix the repository URL in the README file

The repository moved from the stackforge namespace into the openstack
namespace.

Change-Id: Id6bc6bcfaaf3b4462e528bd68ace25825f59f870

jiahaoliang/group-based-policy,stackforge/group-based-policy,noironetworks/group-based-policy,noironetworks/group-based-policy,jiahaoliang/group-based-policy,stackforge/group-based-policy