cluster: move logging library to hack/

it's used once in cluster and used a bunch in hack/ and build/

cluster/common.sh

@@ -25,7 +25,6 @@ KUBE_ROOT=$(cd $(dirname "${BASH_SOURCE}")/.. && pwd)
 DEFAULT_KUBECONFIG="${HOME:-.}/.kube/config"
 
 source "${KUBE_ROOT}/hack/lib/util.sh"
-source "${KUBE_ROOT}/cluster/lib/logging.sh"
 # KUBE_RELEASE_VERSION_REGEX matches things like "v1.2.3" or "v1.2.3-alpha.4"
 #
 # NOTE This must match the version_regex in build/common.sh
@@ -499,7 +498,7 @@ function stage-images() {
   done
 
   kube::util::wait-for-jobs || {
-    kube::log::error "unable to push images. See ${temp_dir}/*.log for more info."
+    echo "!!! unable to push images. See ${temp_dir}/*.log for more info." 1>&2
     return 1
   }