code: def set_scenario_role_names(self):
          
          log = logging.getLogger(self.cls_logger + '.set_scenario_role_names')
          is_master_props = self.get_matching_property_names('isMaster')
          for is_master_prop in is_master_props:
              role_name = is_master_prop.split('.')[-1]
              log.info('Adding scenario host: {n}'.format(n=role_name))
              self.scenario_role_names.append(role_name)
  
              # Determine if this is the scenario master
              is_master = self.get_value(is_master_prop).lower().strip()
              if is_master == 'true':
                  log.info('Found master scenario host: {r}'.format(r=role_name))
                  self.scenario_master = role_name
docs: Populates the list of scenario role names in this deployment and
          populates the scenario_master with the master role
  
          Gets a list of deployment properties containing "isMaster" because
          there is exactly one per scenario host, containing the role name
  
          :return: