code: def __IpsToServerIds(self):
      
      master_instance = self.__GetMasterInstance()
      assert(master_instance)
      retval, response = self.__RunMaprCli('node list -columns id')
      ip_to_id = {}
      for line_num, line in enumerate(response.split('\n')):
        tokens = line.split()
        if len(tokens) == 3 and tokens[0] != 'id':        
          instance_id = tokens[0]
          ip = tokens[2]
          ip_to_id[ip] = instance_id
      return ip_to_id
docs: Get list of mapping of ip address into a server id