修复缩容报错sslconnection创建失败的问题 · Pull Request !379 · openGauss/openGauss-OM

问题根因：
1、dropnode在最后执行switchover的时候指定的超时时间为0，导致cm内部创建ssl连接的超时时间也是0，所以创建失败
2、dropnode在最后不应该reset集群

修改方案：
1、超时时间如果为0，表示使用cm默认的超时时间，无需提供-t参数
2、在dropnode重启集群时，设置无需reset集群
3、顺手清理几行冗余代码

关联issue：
【测试类型：工具功能】【测试版本：3.1.0】 cm集群扩容后执行减容，减容成功但cm提示创建ssl连接失败
https://e.gitee.com/opengaussorg/issues/table?issue=I5TD7U

自验结果：

```
[dc_p@kwepwebenv15400 tool]$ cm_ctl query -Cvip
[  CMServer State   ]

node               node_ip         instance state
---------------------------------------------------
1  kwepwebenv13274 10.247.116.177  1        Primary
2  kwepwebenv15400 10.28.13.71     2        Standby
3  kwepwebenv15396 10.243.217.116  3        Down

[   Cluster State   ]

cluster_state   : Normal
redistributing  : No
balanced        : No
current_az      : AZ_ALL

[  Datanode State   ]

node               node_ip         instance        state            | node               node_ip         instance        state            | node               node_ip         instance        state
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1  kwepwebenv13274 10.247.116.177  6001 14700      P Standby Normal | 2  kwepwebenv15400 10.28.13.71     6002 14700      S Primary Normal | 3  kwepwebenv15396 10.243.217.116  6003 14700      S Standby Normal

[dc_p@kwepwebenv15400 tool]$ gs_dropnode -U dc_p -G xuemn -h 10.243.217.116
The target node to be dropped is (['kwepwebenv15396'])
Do you want to continue to drop the target node (yes/no)?yes
Drop node start with CM node.
Drop node with CM node is running.
[gs_dropnode]Start to drop nodes of the cluster.
[gs_dropnode]Start to stop the target node kwepwebenv15396.
[gs_dropnode]End of stop the target node kwepwebenv15396.
[gs_dropnode]Start to backup parameter config file on kwepwebenv13274.
[gs_dropnode]End to backup parameter config file on kwepwebenv13274.
[gs_dropnode]The backup file of kwepwebenv13274 is /data1/dc_p/install/tmp/gs_dropnode_backup20221222111458/parameter_kwepwebenv13274.tar
[gs_dropnode]Start to parse parameter config file on kwepwebenv13274.
[gs_dropnode]End to parse parameter config file on kwepwebenv13274.
[gs_dropnode]Start to parse backup parameter config file on kwepwebenv13274.
[gs_dropnode]End to parse backup parameter config file kwepwebenv13274.
[gs_dropnode]Start to set openGauss config file on kwepwebenv13274.
[gs_dropnode]End of set openGauss config file on kwepwebenv13274.
[gs_dropnode]Start to backup parameter config file on kwepwebenv15400.
[gs_dropnode]End to backup parameter config file on kwepwebenv15400.
[gs_dropnode]The backup file of kwepwebenv15400 is /data1/dc_p/install/tmp/gs_dropnode_backup20221222111519/parameter_kwepwebenv15400.tar
[gs_dropnode]Start to parse parameter config file on kwepwebenv15400.
[gs_dropnode]End to parse parameter config file on kwepwebenv15400.
[gs_dropnode]Start to parse backup parameter config file on kwepwebenv15400.
[gs_dropnode]End to parse backup parameter config file kwepwebenv15400.
[gs_dropnode]Start to set openGauss config file on kwepwebenv15400.
[gs_dropnode]End of set openGauss config file on kwepwebenv15400.
[gs_dropnode]Start of set pg_hba config file on kwepwebenv13274.
[gs_dropnode]End of set pg_hba config file on kwepwebenv13274.
[gs_dropnode]Start of set pg_hba config file on kwepwebenv15400.
[gs_dropnode]End of set pg_hba config file on kwepwebenv15400.
[gs_dropnode]Start to set repl slot on kwepwebenv15400.
[gs_dropnode]Start to get repl slot on kwepwebenv15400.
[gs_dropnode]End of set repl slot on kwepwebenv15400.
Stopping node.
=========================================
Successfully stopped node.
=========================================
End stop node.
Generate drop flag file on drop node kwepwebenv15396 successfully.
[gs_dropnode]Start to modify the cluster static conf.
[gs_dropnode]End of modify the cluster static conf.
Restart cluster ...
Stopping cluster.
=========================================
Successfully stopped cluster.
=========================================
End stop cluster.
Remove dynamic_config_file and CM metadata directory on all nodes.
Starting cluster.
======================================================================
Successfully started primary instance. Wait for standby instance.
======================================================================
.
Successfully started cluster.
======================================================================
cluster_state      : Normal
redistributing     : No
node_count         : 2
Datanode State
    primary           : 1
    standby           : 1
    secondary         : 0
    cascade_standby   : 0
    building          : 0
    abnormal          : 0
    down              : 0

[gs_dropnode] Success to drop the target nodes.
[dc_p@kwepwebenv15400 tool]$ cm_ctl query -Cvip
[  CMServer State   ]

node               node_ip         instance state
---------------------------------------------------
1  kwepwebenv13274 10.247.116.177  1        Primary
2  kwepwebenv15400 10.28.13.71     2        Standby

[   Cluster State   ]

cluster_state   : Normal
redistributing  : No
balanced        : No
current_az      : AZ_ALL

[  Datanode State   ]

node               node_ip         instance        state            | node               node_ip         instance        state
--------------------------------------------------------------------------------------------------------------------------------------------
1  kwepwebenv13274 10.247.116.177  6001 14700      P Standby Normal | 2  kwepwebenv15400 10.28.13.71     6002 14700      S Primary Normal

```

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