Vendor kubernetes streaming server

Signed-off-by: Lantao Liu <lantaol@google.com>

hack/update-vendor.sh

@@ -23,5 +23,10 @@ set -o pipefail
 # TODO(random-liu): Remove this after #106 is resolved.
 ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"/..
 cd ${ROOT}
+echo "Replace invalid imports..."
 find vendor/ -name *.go | xargs sed -i 's/"github.com\/Sirupsen\/logrus"/"github.com\/sirupsen\/logrus"/g'
+
+echo "Sort vendor.conf..."
+sort vendor.conf -o vendor.conf
+
 echo "Please commit the change made by this file..."