kube-aws: golint fixes
kube-aws: golint fixes

Error messages shouldn't end with punctuation.
Comment formatting for exported symbols.
cluster.ClusterInfo is redundnat, rename to cluster.Info.

turbonomic/coreos-kubernetes,amarruedo/coreos-kubernetes,amarruedo/coreos-kubernetes,coreos/coreos-kubernetes,joshix/coreos-kubernetes,danielfm/coreos-kubernetes,bnea-engineering/coreos-kubernetes,ah45/coreos-kubernetes,limres/coreos-kubernetes,danielfm/coreos-kubernetes,bnea-engineering/coreos-kubernetes,ah45/coreos-kubernetes,amarruedo/coreos-kubernetes,danielfm/coreos-kubernetes,amarruedo/coreos-kubernetes,turbonomic/coreos-kubernetes,chen-anders/coreos-kubernetes,bnea-engineering/coreos-kubernetes,IDKA/coreos-kubernetes,limres/coreos-kubernetes,chen-anders/coreos-kubernetes,coreos/coreos-kubernetes,ah45/coreos-kubernetes,chen-anders/coreos-kubernetes,joshix/coreos-kubernetes,IDKA/coreos-kubernetes,limres/coreos-kubernetes,IDKA/coreos-kubernetes,turbonomic/coreos-kubernetes