Fix use of --pyargs in Docker test script
Fix use of --pyargs in Docker test script

See https://github.com/pytest-dev/pytest/issues/1596

anoukvlug/oggm,OGGM/oggm,anoukvlug/oggm,bearecinos/oggm,OGGM/oggm,TimoRoth/oggm,bearecinos/oggm,TimoRoth/oggm