In order to support running unit tests on RHEL 6.x we need to patch
eventlet with contrib/redhat-eventlet.patch. We already
have support for this in the tools/install_venv_common.py but we need
to make a couple changes to allow tox to consume this:
1) Sync in the latest intall_venv_common.py from oslo. This changes
patch to use the -N option (ignore already applied patches) and makes
it safe to call the patching function more than once.
2) Add a new patch_tox_venv.py script in tools.
3) Update tox.ini to call patch_tox_venv.py before it runs tests and
coverage.
Change-Id: I3e2b07c3f718e4aede5c5f231ff0cdb7721ec885
