No longer call check_uptodate.sh in pep8

check_uptodate.sh re-generates a nova.conf.sample and then compares
it, which was fine. It stopped being fine when we started pulling in
options from oslo, or other modules made releases and then the gate
broke until we fixed the config sample.

Change-Id: I04b2b52a9e46dcf5f4f06e639327f22b827ccd0d
Merge "No longer call check_uptodate.sh in pep8"