label-owners: Add Arrikto folk to relevant labels (#311)
label-owners: Add Arrikto folk to relevant labels (#311)

This commit supplements the label-owners list by adding Arrikto folk to
their relevant labels.

It also starts including the `area/auth` and `area/multiuser` labels
that exist in the Kubeflow repo.

Signed-off-by: Yannis Zarkadas <4575790e8e8b84da294884a87fd791e10dfc7d9d@arrikto.com>
kubeflow/community,kubeflow/community,kubeflow/community,kubeflow/community