message: Use correct RBE platform for our CPU RBE config.
  If we use the old RBE platform the python config does not match it and the toolchain will not be used, resulting in an incorrect python config.
diff: @@ -356,9 +356,10 @@ build:rbe_linux --linkopt=-lm
  build:rbe_cpu_linux --config=rbe_linux
  build:rbe_cpu_linux --crosstool_top="//third_party/toolchains/preconfig/ubuntu16.04/gcc7_manylinux2010:toolchain"
  build:rbe_cpu_linux --extra_toolchains="//third_party/toolchains/preconfig/ubuntu16.04/gcc7_manylinux2010:cc-toolchain-k8"
  -build:rbe_cpu_linux --extra_execution_platforms"=@org_tensorflow//third_party/toolchains:rbe_ubuntu16.04-manylinux2010"
  -build:rbe_cpu_linux --host_platform="@org_tensorflow//third_party/toolchains:rbe_ubuntu16.04-manylinux2010"
  -build:rbe_cpu_linux --platforms="@org_tensorflow//third_party/toolchains:rbe_ubuntu16.04-manylinux2010"
  +build:rbe_cpu_linux --extra_execution_platforms="@ubuntu16.04-manylinux2010-py3_config_platform//:platform"
  +build:rbe_cpu_linux --extra_execution_platforms="@ubuntu16.04-manylinux2010-py3_config_platform//:platform"
  +build:rbe_cpu_linux --host_platform="@ubuntu16.04-manylinux2010-py3_config_platform//:platform"
  +build:rbe_cpu_linux --platforms="@ubuntu16.04-manylinux2010-py3_config_platform//:platform"
  build:rbe_linux_cuda_base --config=rbe_linux
  build:rbe_linux_cuda_base --repo_env=TF_NEED_TENSORRT=1
  