CI: Pass-through Nose configuration to Tox environment
CI: Pass-through Nose configuration to Tox environment

Recent Tox versions clear the environment before running a job. We tell
Nose to output xunit results using this mechanism, so need to whitelist
some settings, otherwise the build breaks (because no xunit file is
generated).

See: https://github.com/openstack/tempest/commit/43073a2bf84ca11e81857e0dc48c8dd593852f36

scality/scality-sproxyd-client