Extend logs for debugging upgrade test failures

cluster/common.sh

@@ -353,13 +353,13 @@ function tars_from_version() {
     SALT_TAR_URL="https://storage.googleapis.com/kubernetes-release/release/${KUBE_VERSION}/kubernetes-salt.tar.gz"
     # TODO: Clean this up.
     KUBE_MANIFESTS_TAR_URL="${SERVER_BINARY_TAR_URL/server-linux-amd64/manifests}"
-    KUBE_MANIFESTS_TAR_HASH=$(curl ${KUBE_MANIFESTS_TAR_URL} | sha1sum | awk '{print $1}')
+    KUBE_MANIFESTS_TAR_HASH=$(curl ${KUBE_MANIFESTS_TAR_URL} 2>/dev/null | sha1sum | awk '{print $1}')
   elif [[ ${KUBE_VERSION} =~ ${KUBE_CI_VERSION_REGEX} ]]; then
     SERVER_BINARY_TAR_URL="https://storage.googleapis.com/kubernetes-release-dev/ci/${KUBE_VERSION}/kubernetes-server-linux-amd64.tar.gz"
     SALT_TAR_URL="https://storage.googleapis.com/kubernetes-release-dev/ci/${KUBE_VERSION}/kubernetes-salt.tar.gz"
     # TODO: Clean this up.
     KUBE_MANIFESTS_TAR_URL="${SERVER_BINARY_TAR_URL/server-linux-amd64/manifests}"
-    KUBE_MANIFESTS_TAR_HASH=$(curl ${KUBE_MANIFESTS_TAR_URL} | sha1sum | awk '{print $1}')
+    KUBE_MANIFESTS_TAR_HASH=$(curl ${KUBE_MANIFESTS_TAR_URL} 2>/dev/null | sha1sum | awk '{print $1}')
   else
     echo "Version doesn't match regexp" >&2
     exit 1

cluster/gce/upgrade.sh

@@ -246,6 +246,7 @@ function do-node-upgrade() {
         --zones="${ZONE}" \
         --regexp="${group}" \
         --format='value(instanceTemplate)' || true))
+    echo "== Calling rolling-update for ${group}. ==" >&2
     update=$(gcloud alpha compute rolling-updates \
         --project="${PROJECT}" \
         --zone="${ZONE}" \
@@ -260,6 +261,7 @@ function do-node-upgrade() {
     updates+=("${id}")
   done
 
+  echo "== Waiting for Upgrading nodes to be finished. ==" >&2
   # Wait until rolling updates are finished.
   for update in ${updates[@]}; do
     while true; do