Removes MANIFEST.in as it is not needed explicitely by PBR
Removes MANIFEST.in as it is not needed explicitely by PBR

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: I77e5bc1e26c354ddf220e2172ba05c0e5e8b98bb

stackforge/python-cueclient