functional: remove unnecessary checking for systemd active states
functional: remove unnecessary checking for systemd active states

For start command, we don't need to explicitly check for systemd
active states, as fleetctl start is already doing that.

jonboulle/fleet,dongsupark/fleet,dongsupark/fleet,coreos/fleet,endocode/fleet,jonboulle/fleet,dongsupark/fleet,coreos/fleet,giantswarm/fleet,coreos/fleet,giantswarm/fleet,endocode/fleet,jonboulle/fleet,giantswarm/fleet,endocode/fleet