Added cffi as a requirement.

This is going to be used in swift for implementing a netifaces replacement that
runs on PyPy.

Change-Id: I8831659a0963dbd9d4d49ef83593a4aa625eb8fd
update global requires on clients for keystone fix

the older version of python-heatclient and python-ceiloclient
actually required an incompatible version of python-keystone client
to the global requirements list. When running devstack without
heat or ceilo enabled (thus no local git trees), horizon becomes
satisified even when you have and old heatclient, which prevents
horizon from installing.

Change-Id: I8480db4a5c3d08a7d739f495920e4b5a442cbb91
Merge "Added cffi as a requirement."
Merge "update global requires on clients for keystone fix"