message: Adds sharding in head_test to prevent timeouts.
diff: @@ -624,8 +624,9 @@ py_library(
  py_test(
  name = "head_test",
  - size = "small",
  + size = "medium",
  srcs = ["canned/head_test.py"],
  + shard_count = 4,
  srcs_version = "PY2AND3",
  tags = ["no_pip"],
  deps = [
  