shell: Clears dialog boxes when canceled
shell: Clears dialog boxes when canceled

entering filled out RAID Device and Create Volume Group dilogs now
clears all input and resets default values

Fixes #757
Closes #812
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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