bugfix:通过前置服务的API启动和关闭群组的异常

[13813385093]

关闭节点所属的全部群组以后，无法再启动的问题。应该是getWeb3j接口调用底层SDK缓存造成的问题，可以直接使用Spring注入的rpcLient类，无需通过群组进行遍历后再创建新的Client对象

com.webank.webase.front.web3api.Web3ApiService

/**

• get first web3j in web3jMap
• @return
  */
  public Client getWeb3j() {
  this.checkConnection();
  Set groupIdSet = bcosSDK.getGroupManagerService().getGroupList(); //1
  log.info("getWeb3j groupIdSet get {}", groupIdSet);
  if (groupIdSet.isEmpty()) {
  log.error("web3jMap is empty, groupList empty! please check your node status");
  // get default web3j of integer max value
  return rpcWeb3j;
  }
  // get random index to get web3j
  Client client = null;
  for (Integer groupId : groupIdSet) {
  try {
  client = bcosSDK.getClient(groupId);
  } catch (BcosSDKException ex) {
  log.error("getClient failed groupId:{}, ex", groupId, ex);
  }
  if (client != null) {
  return client;
  }
  }
  log.warn("getWeb3j finally get null, now return rpcWeb3j");
  return rpcWeb3j;
  }