Flag --incompatible_load_python_rules_from_bzl will break Android Testing in Bazel 1.2.1

Incompatible flag --incompatible_load_python_rules_from_bzl will break Android Testing once Bazel 1.2.1 is released.

Please see the following CI builds for more information:

* [:ubuntu: 18.04 (OpenJDK 11)](:ubuntu: 18.04 (OpenJDK 11))
* [:ubuntu: 16.04 (OpenJDK 8)](:ubuntu: 16.04 (OpenJDK 8))

Questions? Please file an issue in https://github.com/bazelbuild/continuous-integration

**Important**: Please do NOT modify the issue title since that might break our tools.

Start by reproducing the failures in the linked Bazelisk incompatible-flags CI builds for OpenJDK 11 and 8, then inspect the Android testing setup affected by --incompatible_load_python_rules_from_bzl. Done means Android Testing continues to pass with the flag enabled before Bazel 1.2.1; the issue provides no file or test path.

Written by the indexing model from the issue text.