functional: check systemd state of the started units
functional: check systemd state of the started units

To cover the case of a new change for making sure that started units
have active systemd states, CheckListUnits should also check the systemd
unit state, after having started each unit.

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