common: Allow passing -1 as the port to CockpitWebServer
common: Allow passing -1 as the port to CockpitWebServer

This way it'll not listen on any port by default.

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

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