Updated openstack/openstack
Project: openstack/requirements  50c8e7e7f581d87b91ecc6be1097f4893c2ac3ee

Freeze mccabe's version for hacking

mccabe has some drastic changes on master that will not introduce
backwards incompatible behaviour but will make the tool more accurately
compute complexity for various situations. To prevent surprises Joe
Gordon and I have decided to freeze the version now.

Change-Id: I768b785cb61172eb857a7710064e262f007dd138