Update requirements and fix pep issues after it

sync requirements with requirements project:
https://github.com/openstack/requirements/blob/master/global-requirements.txt

With update of hacking dependency fixed pep issues,
appeared with new version.

Change-Id: I90bd1a2b62161a8df40a7ce935c36f3f358924c7
Merge "Update requirements and fix pep issues after it"