docker: Use available storage space when available
docker: Use available storage space when available

Closes #1799
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

vbatts/cockpit,Thermionix/cockpit,vanloswang/cockpit,arilivigni/cockpit,SotolitoLabs/cockpit,xhad/cockpit,nmav/cockpit,darioajr/cockpit,petervo/cockpit,sgallagher/cockpit,Scribery/cockpit,martinpitt/cockpit,dperpeet/cockpit,michalskrivanek/cockpit,vanloswang/cockpit,sgallagher/cockpit,matobet/cockpit,netzvieh/cockpit,Armstrong1992/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,moolitayer/cockpit,petervo/cockpit,fridex/cockpit,larsu/cockpit,cockpit-project/cockpit,larsu/cockpit,martinpitt/cockpit,petervo/cockpit,sgallagher/cockpit,deryni/cockpit,larsu/cockpit,michalskrivanek/cockpit,stefwalter/cockpit,Armstrong1992/cockpit,evol262/cockpit,Armstrong1992/cockpit,cockpit-project/cockpit,firebitsbr/cockpit,moraleslazaro/cockpit,deryni/cockpit,mvollmer/cockpit,michalskrivanek/cockpit,mvollmer/cockpit,arilivigni/cockpit,Thermionix/cockpit,deryni/cockpit,dperpeet/cockpit,FireDrunk/cockpit,firebitsbr/cockpit,zigitax/cockpit,vbatts/cockpit,michalskrivanek/cockpit,martinpitt/cockpit,cockpituous/cockpit,nmav/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,fridex/cockpit,maxamillion/cockpit,denysvitali/cockpit,mvollmer/cockpit,petervo/cockpit,denysvitali/cockpit,harishanand95/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,evol262/cockpit,mvollmer/cockpit,harishanand95/cockpit,andreasn/cockpit,maxamillion/cockpit,zigitax/cockpit,FireDrunk/cockpit,matobet/cockpit,larsu/cockpit,larskarlitski/cockpit,stefwalter/cockpit,vanloswang/cockpit,sgallagher/cockpit,andreasn/cockpit,vbatts/cockpit,cockpit-project/cockpit,andreasn/cockpit,moraleslazaro/cockpit,nmav/cockpit,deryni/cockpit,harishanand95/cockpit,vanloswang/cockpit,Scribery/cockpit,jscotka/cockpit,cockpituous/cockpit,moolitayer/cockpit,stefwalter/cockpit,garrett/cockpit,fridex/cockpit,haiyangd/cockpit_view,arilivigni/cockpit,arilivigni/cockpit,netzvieh/cockpit,stefwalter/cockpit,larsu/cockpit,fridex/cockpit,dperpeet/cockpit,jscotka/cockpit,FireDrunk/cockpit,cockpituous/cockpit,jscotka/cockpit,cockpit-project/cockpit,stefwalter/cockpit,netzvieh/cockpit,martinpitt/cockpit,larskarlitski/cockpit,maxamillion/cockpit,evol262/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,sgallagher/cockpit,darioajr/cockpit,nmav/cockpit,garrett/cockpit,FireDrunk/cockpit,dperpeet/cockpit,evol262/cockpit,maxamillion/cockpit,Thermionix/cockpit,vanloswang/cockpit,larskarlitski/cockpit,petervo/cockpit,dperpeet/cockpit,Thermionix/cockpit,arilivigni/cockpit,netzvieh/cockpit,FireDrunk/cockpit,evol262/cockpit,mareklibra/cockpit,arilivigni/cockpit,nmav/cockpit,garrett/cockpit,jscotka/cockpit,evol262/cockpit,michalskrivanek/cockpit,xhad/cockpit,moraleslazaro/cockpit,matobet/cockpit,stefwalter/cockpit,matobet/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,maxamillion/cockpit,Scribery/cockpit,darioajr/cockpit,moolitayer/cockpit,denysvitali/cockpit,firebitsbr/cockpit,moolitayer/cockpit,fridex/cockpit,mvollmer/cockpit,sgallagher/cockpit,vanloswang/cockpit,vbatts/cockpit,moolitayer/cockpit,matobet/cockpit,Scribery/cockpit,cockpit-project/cockpit,Scribery/cockpit,haiyangd/cockpit_view,haiyangd/cockpit_view,vbatts/cockpit,michalskrivanek/cockpit,garrett/cockpit,xhad/cockpit,denysvitali/cockpit,zigitax/cockpit,harishanand95/cockpit,dperpeet/cockpit,haiyangd/cockpit_view,fridex/cockpit,harishanand95/cockpit,netzvieh/cockpit,Thermionix/cockpit,larskarlitski/cockpit,deryni/cockpit,darioajr/cockpit,Armstrong1992/cockpit,Scribery/cockpit,martinpitt/cockpit,garrett/cockpit,dperpeet/cockpit,firebitsbr/cockpit,netzvieh/cockpit,matobet/cockpit,mareklibra/cockpit,Thermionix/cockpit,cockpituous/cockpit,Scribery/cockpit,vbatts/cockpit,zigitax/cockpit,sgallagher/cockpit,michalskrivanek/cockpit,cockpituous/cockpit,denysvitali/cockpit,arilivigni/cockpit,zigitax/cockpit,harishanand95/cockpit,firebitsbr/cockpit,petervo/cockpit,vanloswang/cockpit,Armstrong1992/cockpit,larsu/cockpit,andreasn/cockpit,deryni/cockpit,andreasn/cockpit,petervo/cockpit,deryni/cockpit,mareklibra/cockpit,harishanand95/cockpit,larskarlitski/cockpit,moraleslazaro/cockpit,xhad/cockpit,larskarlitski/cockpit,jscotka/cockpit,haiyangd/cockpit_view,mareklibra/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,darioajr/cockpit,moraleslazaro/cockpit,jscotka/cockpit,andreasn/cockpit,cockpituous/cockpit,xhad/cockpit,xhad/cockpit,SotolitoLabs/cockpit,xhad/cockpit,larskarlitski/cockpit