Temporarily disable bazel_docker container test. (#95)

* Temporarily disable bazel_docker container test.

This is causing flakiness, will reenable it once fix in
base-image-docker is in.
diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index 980c783..b79200e 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -17,7 +17,8 @@
     - "//container/ubuntu16_04/builders/rbe-ubuntu16_04:toolchain-test"
     - "//container/experimental/rbe-debian9:toolchain-test"
     - "//container/ubuntu16_04/builders/bazel:bazel-test"
-    - "//container/ubuntu16_04/builders/bazel:bazel_docker-test"
+    # TODO(xingao) Re-enable the test.
+    # - "//container/ubuntu16_04/builders/bazel:bazel_docker-test"
     test_flags:
     - "--test_output=errors"
     - "--verbose_failures"
@@ -38,7 +39,8 @@
     - "//container/ubuntu16_04/builders/rbe-ubuntu16_04:toolchain-test"
     - "//container/experimental/rbe-debian9:toolchain-test"
     - "//container/ubuntu16_04/builders/bazel:bazel-test"
-    - "//container/ubuntu16_04/builders/bazel:bazel_docker-test"
+    # TODO(xingao) Re-enable the test.
+    # - "//container/ubuntu16_04/builders/bazel:bazel_docker-test"
     test_flags:
     - "--test_output=errors"
     - "--verbose_failures"