[sr-dev] [kamailio/kamailio] module keepalive bug report (Issue #3028)

[狐狐]

### Description

  Ka servers A(172.22.247.37) and B(172.22.247.232) use the keepalive module to check  if each other's status is available. When one server such as B is down, server A will still send about 16 OPTIONS messages. When A sends the 14th or 15th OPTIONS, ka on A will change B's status to down. At this point, if B restarts, B will reply 200OK to A’s OPTIONS message, and A will change B's status to alive, but A will not send OPTIONS message to B any more. Even if B dies later, B's status will be alive on A forever.

  ps: if B is restart at the 14th OPTIONS or earlier, A will correctly send heartbeat OPTIONS to B later. if B is restart at the 16th or later, A will not change B's status to alive, and certainly will not sends OPTIONS to B anymore, but this is correct  isn't it?

  question is obviously B’s status is alive on A, but A sends no OPTIONS to B.

### Troubleshooting

![image](https://user-images.githubusercontent.com/26111722/154245407-93f3ac77-3c22-4129-9877-9efa317007a5.png)
![image](https://user-images.githubusercontent.com/26111722/154245553-d19c8121-27ef-448b-933d-153843c61048.png)

#### Reproduction

1. set keepalive config ant A
```
loadmodule "keepalive.so"
modparam("keepalive","ping_interval",3)
modparam("keepalive","destination","172.22.247.232")
```
use ka_is_alive function check B's status.
2. restart A server and confirm that the OPTIONS status is correct.
3. stop the B server until the number of retran messages reaches 15.
4. restart B server, and check OPTIONS


#### Log Messages

![image](https://user-images.githubusercontent.com/26111722/154245407-93f3ac77-3c22-4129-9877-9efa317007a5.png)

#### SIP Traffic

![image](https://user-images.githubusercontent.com/26111722/154245553-d19c8121-27ef-448b-933d-153843c61048.png)
at the time that the arrow points to, 172.22.247.232's status is 1(refers to the log above). but notice that there is no OPTIONS message to 172.22.247.232 anymore.
![image](https://user-images.githubusercontent.com/26111722/154248962-fa6efd08-361c-4be1-b3cf-3c452d6b4e36.png)
![image](https://user-images.githubusercontent.com/26111722/154249002-f1c6b80e-2880-4c6b-bfb0-4a0f3963c6b8.png)

### Possible Solutions


### Additional Information


* **Operating System**:

```
Linux localhost.localdomain 3.10.0-1127.el7.x86_64 #1 SMP Tue Mar 31 23:36:51 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
kamailio 5.5.2
```


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