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

Ec2-api 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: I3eafb35c6a8ecd89cb5719e63954aabae7899830
Closes-Bug:#1608980

stackforge/ec2-api,stackforge/ec2-api,openstack/ec2-api,openstack/ec2-api