users: Add another admin group for weldr
users: Add another admin group for weldr

This group allows users to attach to the lorax-composer socket.
In the UI we can add people to this group.

Closes #9476
garrett/cockpit,deryni/cockpit,andreasn/cockpit,deryni/cockpit,mvollmer/cockpit,cockpituous/cockpit,mareklibra/cockpit,mareklibra/cockpit,martinpitt/cockpit,cockpit-project/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,cockpituous/cockpit,garrett/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,martinpitt/cockpit,andreasn/cockpit,moraleslazaro/cockpit,deryni/cockpit,mareklibra/cockpit,garrett/cockpit,andreasn/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,deryni/cockpit,SotolitoLabs/cockpit,mvollmer/cockpit,mareklibra/cockpit,mvollmer/cockpit,andreasn/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,mvollmer/cockpit,cockpituous/cockpit,mareklibra/cockpit,mareklibra/cockpit,cockpit-project/cockpit,deryni/cockpit,andreasn/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,deryni/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,garrett/cockpit,martinpitt/cockpit,cockpit-project/cockpit,garrett/cockpit,cockpituous/cockpit,deryni/cockpit,cockpituous/cockpit,martinpitt/cockpit