test: Add option to skip build in vm-create
test: Add option to skip build in vm-create

Sometimes we want our test virtual machine just to test
already built packages. In those cases, there's no need
to install mock and try rebuilding the packages first.

Closes #4562
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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