test: Add knowledge of debian-testing images
test: Add knowledge of debian-testing images

Add knowledge of debian-testing images to the verify machines
test harnesses.

Closes #5725
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

Scribery/cockpit,mareklibra/cockpit,sgallagher/cockpit,xhad/cockpit,mareklibra/cockpit,andreasn/cockpit,moraleslazaro/cockpit,larskarlitski/cockpit,garrett/cockpit,xhad/cockpit,larskarlitski/cockpit,Scribery/cockpit,Scribery/cockpit,deryni/cockpit,martinpitt/cockpit,deryni/cockpit,moraleslazaro/cockpit,harishanand95/cockpit,mareklibra/cockpit,sgallagher/cockpit,arilivigni/cockpit,michalskrivanek/cockpit,larsu/cockpit,petervo/cockpit,mvollmer/cockpit,larsu/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,sgallagher/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,harishanand95/cockpit,arilivigni/cockpit,cockpit-project/cockpit,Scribery/cockpit,moraleslazaro/cockpit,dperpeet/cockpit,arilivigni/cockpit,arilivigni/cockpit,harishanand95/cockpit,mareklibra/cockpit,xhad/cockpit,cockpituous/cockpit,michalskrivanek/cockpit,andreasn/cockpit,mareklibra/cockpit,andreasn/cockpit,deryni/cockpit,xhad/cockpit,xhad/cockpit,Scribery/cockpit,cockpit-project/cockpit,andreasn/cockpit,larsu/cockpit,xhad/cockpit,arilivigni/cockpit,mvollmer/cockpit,arilivigni/cockpit,cockpit-project/cockpit,larskarlitski/cockpit,SotolitoLabs/cockpit,petervo/cockpit,cockpituous/cockpit,larskarlitski/cockpit,Scribery/cockpit,larskarlitski/cockpit,cockpit-project/cockpit,mvollmer/cockpit,deryni/cockpit,larskarlitski/cockpit,stefwalter/cockpit,harishanand95/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,stefwalter/cockpit,petervo/cockpit,andreasn/cockpit,cockpituous/cockpit,garrett/cockpit,cockpit-project/cockpit,SotolitoLabs/cockpit,dperpeet/cockpit,mvollmer/cockpit,sgallagher/cockpit,larsu/cockpit,stefwalter/cockpit,sgallagher/cockpit,larsu/cockpit,martinpitt/cockpit,dperpeet/cockpit,michalskrivanek/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,michalskrivanek/cockpit,cockpituous/cockpit,stefwalter/cockpit,sgallagher/cockpit,garrett/cockpit,stefwalter/cockpit,harishanand95/cockpit,cockpituous/cockpit,dperpeet/cockpit,andreasn/cockpit,martinpitt/cockpit,michalskrivanek/cockpit,dperpeet/cockpit,harishanand95/cockpit,deryni/cockpit,michalskrivanek/cockpit,SotolitoLabs/cockpit,petervo/cockpit,sgallagher/cockpit,martinpitt/cockpit,garrett/cockpit,harishanand95/cockpit,Scribery/cockpit,moraleslazaro/cockpit,garrett/cockpit,moraleslazaro/cockpit,deryni/cockpit,dperpeet/cockpit,larskarlitski/cockpit,stefwalter/cockpit,mareklibra/cockpit,michalskrivanek/cockpit,moraleslazaro/cockpit,petervo/cockpit,larsu/cockpit,dperpeet/cockpit,andreasn/cockpit,arilivigni/cockpit,petervo/cockpit,petervo/cockpit,xhad/cockpit,mvollmer/cockpit,deryni/cockpit,SotolitoLabs/cockpit