travis: Refactor yaml file
travis: Refactor yaml file

Putting packages in individual lines increases readability.

Closes #4117
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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