An editable installation allows changes to be made to the source code
directly, and have those changes applied immediately without having to
reinstall.
pip install -e /path/to/kolla-ansible
Change-Id: I023d96d25edd9d2fafd4415743e298af72a861a1
(cherry picked from commit 5fb37ae58494cda74fba49ade43d082fb6b69288)