code: private static FailStrategy howToDealFailure(NaviFailStrategy failStg) {
          if (NaviFailStrategy.FAILOVER.equals(failStg)) {
              return new FailOverStrategy(RpcClientConf.RPC_RETRY_TIMES);
          } else if (NaviFailStrategy.FAILFAST.equals(failStg)) {
              return new FailFastStrategy();
          }
          return new FailOverStrategy();
      }
docs: 构造容错处理策略
  
  @param failStg
  @return