add csi-test to vendor

vendor/github.com/golang/mock/ci/check_go_generate.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+# This script is used by the CI to check if 'go generate ./...' is up to date.
+#
+# Note: If the generated files aren't up to date then this script updates
+# them despite printing an error message so running it the second time
+# might not print any errors. This isn't very useful locally during development
+# but it works well with the CI that downloads a fresh version of the repo
+# each time before executing this script.
+
+set -euo pipefail
+
+TEMP_DIR=$( mktemp -d )
+function cleanup() {
+    rm -rf "${TEMP_DIR}"
+}
+trap cleanup EXIT
+
+cp -r . "${TEMP_DIR}/"
+go generate ./...
+if ! diff -r . "${TEMP_DIR}"; then
+    echo
+    echo "The generated files aren't up to date."
+    echo "Update them with the 'go generate ./...' command."
+    exit 1
+fi