test: Run fresh browser for each TestReverseProxy scenario
test: Run fresh browser for each TestReverseProxy scenario

These scenarios potentially influenced each other through stored browser
cookies and site data.

martinpitt/cockpit,martinpitt/cockpit,martinpitt/cockpit,martinpitt/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,cockpit-project/cockpit