Files are bind-mounted into the container in different locations.
Set envvars pointing to the right places.
Also - we need to bind-mount the projects.yaml and projects.ini
files into the container.
While we're at it, move patchset-created to be a regular file.
Change-Id: Iacd3e921464b24479db13bbf7ae998b8d8e2103d
27dfd250af