test: Avoid ipv4.dhcp-hostname as the "other" setting
test: Avoid ipv4.dhcp-hostname as the "other" setting

Some versions of NetworkManager reset it when changing ipv4.method to
"shared".

Closes #8093

cockpituous/cockpit,petervo/cockpit,cockpituous/cockpit,deryni/cockpit,andreasn/cockpit,Scribery/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,Scribery/cockpit,Scribery/cockpit,mareklibra/cockpit,cockpituous/cockpit,Scribery/cockpit,martinpitt/cockpit,stefwalter/cockpit,petervo/cockpit,stefwalter/cockpit,garrett/cockpit,stefwalter/cockpit,mvollmer/cockpit,cockpit-project/cockpit,mareklibra/cockpit,mareklibra/cockpit,petervo/cockpit,moraleslazaro/cockpit,Scribery/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,Scribery/cockpit,deryni/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,deryni/cockpit,cockpit-project/cockpit,andreasn/cockpit,moraleslazaro/cockpit,Scribery/cockpit,petervo/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpituous/cockpit,petervo/cockpit,martinpitt/cockpit,andreasn/cockpit,andreasn/cockpit,petervo/cockpit,garrett/cockpit,deryni/cockpit,andreasn/cockpit,stefwalter/cockpit,stefwalter/cockpit,garrett/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,andreasn/cockpit,andreasn/cockpit,mareklibra/cockpit,garrett/cockpit,deryni/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,garrett/cockpit,petervo/cockpit,SotolitoLabs/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpituous/cockpit,deryni/cockpit