[sr-dev] [kamailio/kamailio] tls: allow export session keys (#2785)

[sergey-safarov]

#### Pre-Submission Checklist
- [x] Commit message has the format required by CONTRIBUTING guide
- [ ] Commits are split per component (core, individual modules, libs, utils, ...)
- [ ] Each component has a single commit (if not, squash them into one commit)
- [x] No commits to README files for modules (changes must be done to docbook files
in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
- [ ] PR should be backported to stable branches
- [x] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description
Wireshark project allows embedding session encryption keys into PCAP files. So it allows parsing encrypted packets as it was unencrypted.
[More info](https://blog.didierstevens.com/2021/01/11/decrypting-tls-streams-with-wireshark-part-3/)
I prepared a change that allows export session encryption keys.
Please review PR. If ok, then I add commits with DocBook info.

Kyys may be emeberd using command
```
editcap --inject-secrets tls,/var/lib/kamailio/session_keylog encrypted.pcap with_keys.pcapng
```

As prototype used
https://github.com/openssl/openssl/blob/master/apps/lib/s_cb.c#L1480-L1525
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2785

-- Commit Summary --

  * tls: added new session_keylog_enable and session_keylog_filename configuration params
  * tls: first interation of session key logger
  * tls: added logs output

-- File Changes --

    M src/modules/tls/tls_cfg.c (6)
    M src/modules/tls/tls_cfg.h (2)
    M src/modules/tls/tls_init.c (79)
    M src/modules/tls/tls_init.h (2)
    M src/modules/tls/tls_mod.c (2)
    M src/modules/tls/tls_rpc.c (2)
    M src/modules/tls/tls_server.c (1)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2785.patch
https://github.com/kamailio/kamailio/pull/2785.diff

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