Fix pep8 errors and make it pass Jenkins tests.

Fix all existing pep8 errors.
Remove install_venv and friends, which were not needed.
Add a few ignores for nova code that is yet to be cleaned up.
Skip one failing test case, fixed by review 29394.
Import contrib/redhat-eventlet.patch from Nova.

Change-Id: I46b6ccaa272bd058757064672ce9221263ed7087