Enable tox to run inside containers
Seems like this change is necessary to be able to execute `tox` inside a
container, so why not?
@@ -4,6 +4,7 @@ envlist = py27,py35,pep8
skipsdist = True
[testenv]
+passenv = HOME
setenv = VIRTUAL_ENV={envdir}
usedevelop = True
install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
