Make it possible to install existing python modules "editably"
Make it possible to install existing python modules "editably"

This is a small change to make the pip rules refresh correctly when passing
an existing git repo to `pip install -e`.

Bug: T181850
Change-Id: I6f31ec47541370576f97f5512091189ff2cc7b48

wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant