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

Keystone 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: I12c08e895c2d4516e771cc6b505fd25322e2660d
Closes-Bug:#1608980

rajalokan/keystone,openstack/keystone,ilay09/keystone,ilay09/keystone,ilay09/keystone,rajalokan/keystone,rajalokan/keystone,mahak/keystone,mahak/keystone,openstack/keystone,mahak/keystone,openstack/keystone