docs: def _generate_requirements(self):
          """Generate the info to create requirements.txt in the toookit."""
          if not self._pip_packages:
              return
  
          reqs = ''
          for req in self._pip_packages:
                  reqs += "{}\n".format(req)
          reqs_include = {
              'contents': reqs,
              'target':'opt/python/streams',
              'name': 'requirements.txt'}
  
          if 'opt' not in self._files:
               self._files['opt'] = [reqs_include]
          else:
               self._files['opt'].append(reqs_include)