Neutron Model update

Neutron Model update

This patch includes Neutron API/model changes being
introduced.
1) Status field to be moved to operational datastore
Breaking out the status field from this patch
for ease of review and merge process.
Link to status field patch
https://git.opendaylight.org/gerrit/#/c/51981/
2) Project id field is going to depreciate tenant id
https://lists.opendaylight.org/pipermail/neutron-dev/2016-December/001083.html
This fix addresses top level tenant-id used my most models.
Some models internally also use tenant-id in sub-fields. Those
cases will be addressed in Nitrogen.
3) revision number field to be added. This is a monotonic
counter that will be updated whenever an object is updated
on the neutron server.

Change-Id: I8a76fe5ff1147a9e4456c0713913377f266cec24
Signed-off-by: Ritu Sood <ritu.sood@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>