ensure CEPH_DEPLOY_TEST is set in tox.ini

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
only close stderr if we are not testing

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
make sure we can still exit with proper exit codes

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>