This is the smallest set of changes needed to unwedge the gate. Because
the gate is wedged all these changes need to be in a single patch in
order to fix it.
* point .gitreview at correct repo
pep8
* Don't run tools/config/check_uptodate.sh, we don't even have a config
file to check yet.
* gantt, doesn't have any local hacking checks yet so remove that
section from tox.ini
* Update import_exceptions in tox.ini
pylint
* copy lintstack code in from nova.
docs
* add gantt version code, copied in from nova
Change-Id: I1d7adb5bf1bf383a2f8543dda6eb4cdeb26f3b9a
a4883260df