[openstack-helm] Nominate Karl Kloppenborg for openstack-helm-core

Dear Openstack-helmers, I would like to suggest Karl Kloppenborg as a member of the core review team. He's been actively doing code review recently and also contributed as a developer. He has been using Openstack-Helm for a few years now, so his experience as a user is also to our advantage. I hope for your support. -- Best regards, Kozhukalov Vladimir