use xx pipfile when available

old-commit-hash: 81433f1e54

update_requirements.sh

@@ -32,6 +32,7 @@ pip install --upgrade pip
 pip install pipenv
 
 echo "pip packages install ..."
+[ -d "./xx" ] && cd ./xx
 pipenv install --dev --deploy --system
 # update shims for newly installed executables (e.g. scons)
 pyenv rehash