message: Add tensorflow_estimator pip package to install_pip_packages.sh
  We will need this for remote-build presubmits to pass.
diff: @@ -124,6 +124,10 @@ pip3 install keras_preprocessing==1.0.5 --no-deps
  pip2 install --upgrade h5py==2.8.0
  pip3 install --upgrade h5py==2.8.0
  +# Estimator
  +pip2 install tensorflow_estimator --no-deps
  +pip3 install tensorflow_estimator --no-deps
  +
  # Install last working version of setuptools.
  pip2 install --upgrade setuptools==39.1.0
  pip3 install --upgrade setuptools==39.1.0
  