Drop MANIFEST.in - it's not needed by pbr
Drop MANIFEST.in - it's not needed by pbr

neutron-vpnaas already uses PBR:-
setuptools.setup(
	setup_requires=['pbr>=1.8'],
	pbr=True)

This patch removes `MANIFEST.in` file as pbr generates a
sensible manifest from git files and some standard files
and it removes the need for an explicit `MANIFEST.in` file.

Change-Id: I1c7992cc13e5210f93e15a96b8151be679acee1f

openstack/neutron-vpnaas,openstack/neutron-vpnaas