Changes prompted by the new pip resolver doing stricter dependency
checking:
- req, lc: cinder to 16.0.0 (ussuri official release)
- req: restrict cinder to < 17.0.0 (victoria) because cinder is not
in upper-constraints
- req, lc: os-brick: to 3.0.1 (ussuri official release)
- update test-req to match cinder stable/ussuri versions
- added some indirect dependencies to test-requirements.txt to help
speed up dependency resolution
- doc/req: openstackdocstheme, reno exceeded ussuri upper constraint
- tox.ini: base testenv: added upper-constraints and changed it to
use cinder and os-brick from pypi instead of master
Change-Id: I86ccab516108615d6f718c6fdc9d3e4fad67ee05