Functional tests debug support
Functional tests debug support

Pass OS_* options into tox debug venv in order to
debug functional tests in local, and install ipdb
to make code-debug more convenient.

Change-Id: Ib926948f2b9a52921cf7487fe16ef716481e3ceb

openstack/python-openstackclient,dtroyer/python-openstackclient,dtroyer/python-openstackclient,openstack/python-openstackclient