cockpit.service: use cockpit-certificate-ensure
cockpit.service: use cockpit-certificate-ensure

Stop calling remotectl and use cockpit-certificate-ensure, instead.

mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,garrett/cockpit,mvollmer/cockpit,garrett/cockpit,martinpitt/cockpit,mvollmer/cockpit,martinpitt/cockpit,garrett/cockpit,martinpitt/cockpit,martinpitt/cockpit,garrett/cockpit,mvollmer/cockpit,martinpitt/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,garrett/cockpit,cockpit-project/cockpit