Revert "Revert "Fix libvirt-coreos cluster""

This reverts commit 889d724c19.

cluster/common.sh

@@ -80,7 +80,9 @@ function create-kubeconfig() {
   fi
 
   "${kubectl}" config set-cluster "${CONTEXT}" "${cluster_args[@]}"
+  if [ -n "${user_args[@]:-}" ]; then
       "${kubectl}" config set-credentials "${CONTEXT}" "${user_args[@]}"
+  fi
   "${kubectl}" config set-context "${CONTEXT}" --cluster="${CONTEXT}" --user="${CONTEXT}"
   "${kubectl}" config use-context "${CONTEXT}"  --cluster="${CONTEXT}"
 

cluster/libvirt-coreos/util.sh

@@ -200,7 +200,6 @@ function wait-cluster-readiness {
 function kube-up {
   detect-master
   detect-minions
-  get-password
   initialize-pool keep_base_image
   initialize-network
 
@@ -328,12 +327,6 @@ function test-teardown {
   kube-down
 }
 
-# Set the {KUBE_USER} and {KUBE_PASSWORD} environment values required to interact with provider
-function get-password {
-  export KUBE_USER=''
-  export KUBE_PASSWORD=''
-}
-
 # SSH to a node by name or IP ($1) and run a command ($2).
 function ssh-to-node {
   local node="$1"