Drop MANIFEST.in - pbr doesn't need it
Drop MANIFEST.in - pbr doesn't need it

Networking-odl already uses PBR.
PBR doesn't need MANIFEST.in

Change-Id: I172f4105c778fd293d320cc11b193cb2f3481418
Closes-Bug: #1608980

openstack/networking-odl,openstack/networking-odl,openstack/networking-odl