shell: Default to no STP for network bridges.
shell: Default to no STP for network bridges.

Closes #1050
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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