functional: run go test just once, without unit state cache option
functional: run go test just once, without unit state cache option

As the unit state cache is going to be obsolete, functional test does
not need to run go test with unit state cache enabled. So let's remove
the second run for now.

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