code: async function listConnections() {
      const connList = await executeCommand(
          ['nmcli', '-f', 'NAME,DEVICE', '-t', 'connection', 'show']);
      const ret = {};
      connList.split('\n').map((l) => {
          return l.split(/:/);
      }).filter((ary) => {
          return ary[0] && ary[1];
      }).forEach((ary) => {
          ret[ary[0]] = ary[1];
      });
      return ret;
  }
docs: List connection names with device name
  @return {Array.<object>} Return list of connection name and device name