[sr-dev] [kamailio/kamailio] t_replicate transaction failures keeps transaction in memory forever (#1220)

[Olle E. Johansson]

After fixing the firewall we still have issues. I see the TCP keepalives coming, but replication stopped, no SIP messages flowing and tm.stats has a big pile of open transactions, no more shm memory available.
Current and waiting seems to follow each other. No calls during the night, so this is only registrations. 300 devices connected. I will have to go back to replication over UDP or stateless replication using forward to get stability.

```
# kamcmd tm.stats
{
	current: 19965
	waiting: 19965
	total: 42187
	total_local: 0
	rpl_received: 42207
	rpl_generated: 10
	rpl_sent: 42211
	6xx: 0
	5xx: 1
	4xx: 4
	3xx: 0
	2xx: 42191
	created: 42187
	freed: 22221
	delayed_free: 0
}
```

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