cli: fix golint complaints
cli: fix golint complaints

mjg59/mantle,quantum/coreos-mantle,dm0-/mantle,mischief/mantle,marineam/mantle,glevand/coreos--mantle,glevand/coreos--mantle,marineam/mantle,mjg59/mantle,dm0-/mantle,quantum/coreos-mantle,mischief/mantle