Merge pull request #1876 from tensorflow/minglotus-6-patch-1

Use bazel 0.24.1 in r2.1

Author: mingmingl-llvm

WORKSPACE

@@ -40,4 +40,4 @@ tf_serving_workspace()
 
 # Specify the minimum required bazel version.
 load("@org_tensorflow//tensorflow:version_check.bzl", "check_bazel_version_at_least")
-check_bazel_version_at_least("0.29.1")
+check_bazel_version_at_least("0.24.1")