执行gs_basebackup过程中备节点异常，gs_basebackup进程阻塞无法退出

**Is this a BUG REPORT or FEATURE REQUEST?**:

> Uncomment only one, leave it on its own line: 
>
> - bug

**What happened**:
备节点执行failover过程中，执行gs_basebackup，gs_basebackup被中断但是进程无法退出
**What you expected to happen**:
gs_basebackup有错误提示，进程退出

**How to reproduce it (as minimally and precisely as possible)**:
1.备节点执行failover
gs_ctl failover -D xxx
2.failover的同时备份备节点
gs_basebackup -D xxx -h xxx -p xxx -v -t 3600
堆栈信息如下：
```
#0  0x00007ff495c01f47 in pthread_join () from /lib64/libpthread.so.0
#1  0x000055c54ad26279 in closeHearBeatTimer () at receivelog.cpp:271
#2  0x000055c54ad26f8f in ReceiveXlogStream (conn=0x55c54cf0f3c0, startpos=<optimized out>, timeline=1, sysidentifier=<optimized out>,
    basedir=basedir@entry=0x55c54cf0efa0 "/data/reliability0708/cluster/base_backup/pg_xlog", stream_stop=stream_stop@entry=0x55c54ad1fd40 <reached_end_position(XLogRecPtr, uint32, bool)>,
    standby_message_timeout_local=10, rename_partial=true) at receivelog.cpp:881
#3  0x000055c54ad241d7 in LogStreamerMain (param=0x55c54cf0ef90) at pg_basebackup.cpp:378
#4  StartLogStreamer (sysidentifier=0x55c54cf0d260 "18020659533282547393", timeline=1, startpos=0x7ffc67230640 "75/1A000258") at pg_basebackup.cpp:458
#5  BaseBackup () at pg_basebackup.cpp:1320
#6  0x000055c54ad25666 in GsBaseBackup (argc=10, argv=0x7ffc67233118) at pg_basebackup.cpp:2098
#7  0x00007ff49584e3d5 in __libc_start_main () from /lib64/libc.so.6
#8  0x000055c54ad1f725 in _start ()
```

**Anything else we need to know?**:

**Environment**:
- Version:
gaussdb (openGauss 2.0.0 build 0236725f) compiled at 2021-07-07 20:04:33 commit 0 last mr
- OS (e.g. from /etc/os-release):
- Kernel (e.g. `uname -a`):
- Install tools:
- Others:

openGauss/openGauss-server

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