Updated openstack/openstack
Project: openstack/oslo.serialization  f3aa93cb194394d92bb03904186af2bb31e6f80c

Fix pep8, docs, requirements issues in jsonutils and tests

Fixes pep8 issues in jsonutils and tests, fixes
documentation build issues, brings the version of
hacking in line with openstack/requirements.

Change-Id: I207c5d632f6c879613496d61931dc4817d5b74d0