[sr-dev] [kamailio/kamailio] tm: enhance fr/retr timers logging (#2818)

[Maksym Rudenko]

- Mention when FR timeout is reached, and which of FR timers expired
- Log when starting FR/RETR timers
- log when changing default timeouts to user-set values
- log when resetting fr/retr timers on provisional replies

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#### Description
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The main reason for these changes is that we haven't found any possibility to distinguish which of `fr` timeouts expires. The rest of the logs are also helpful, but secondary. 
As they all are under `ifdef TIMEOUT_DEBUG` I hope it is not a big deal.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2818

-- Commit Summary --

  * tm: enhance fr/retr timers logging

-- File Changes --

    M src/modules/tm/t_lookup.c (6)
    M src/modules/tm/t_reply.c (3)
    M src/modules/tm/t_suspend.c (3)
    M src/modules/tm/timer.c (7)
    M src/modules/tm/timer.h (4)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2818.patch
https://github.com/kamailio/kamailio/pull/2818.diff

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