message: Fix the pip install TLS issue for pip test builds.
diff: @@ -314,7 +314,10 @@ create_activate_virtualenv_and_install_tensorflow() {
  # Upgrade pip so it supports tags such as cp27mu, manylinux1 etc.
  echo "Upgrade pip in virtualenv"
  - pip install --upgrade pip==9.0.1
  +
  + # NOTE: pip install --upgrade pip leads to a documented TLS issue for
  + # some versions in python
  + curl https://bootstrap.pypa.io/get-pip.py | python
  # Force tensorflow reinstallation. Otherwise it may not get installed from
  # last build if it had the same version number as previous build.
  