Enable multi tenancy by default

Change-Id: Idf96ed36886ffc73dcb7af347eb8d0bce98f5718
heat support
- setup keystone endpoints
- setup heat server

Change-Id: Ibda7ce9c0ad69d8b212d9fa314bae61204afaabb
Added support for external NFS server for live migration

Support added for live migration configuration with an
external NFS server.
Closes-Bug: #1376877

Change-Id: Ie1379330339b8b8471a6a5277e8174afa63b8cc5
Heat supported only in centos-icehouse. check to skip provisioning heat in centos-havana.

Change-Id: If7a7ce51c34914c8cc1442c2b5bde319ec836dca
Merge commit '1061e8a44b50ccc4e29d6663ef066293a7764536' into HEAD
Merge pull request #2 from rajreddy/rajreddy_2375

Rajreddy 2375