code: def is_user_reseller_admin(self, req, account, user):
          
          req.credentials_valid = True
          user_json = self.get_user_detail(req, account, user)
          if user_json is None:
              req.credentials_valid = False
              return False
  
          user_detail = json.loads(user_json)
  
          return '.reseller_admin' in (g['name'] for g in user_detail['groups'])
docs: Returns True if the user is a .reseller_admin.
  
          :param account: account user is part of
          :param user: the user
          :returns: True if user .reseller_admin, False
                    if user is not a reseller_admin and None if the user
                    doesn't exist.