storage: Use size sliders for partition etc sizes
storage: Use size sliders for partition etc sizes

Fixes #1116
Closes #3876
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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