[sr-dev] [kamailio/kamailio] kex: fix and cleanup stats rpc (#2537)

[Alex Hermann]

#1762 ## Pre-Submission Checklist
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- [x] Commit message has the format required by CONTRIBUTING guide
- [x] Commits are split per component (core, individual modules, libs, utils, ...)
- [x] 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
- [x] Small bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds new functionality)
- [x] Breaking change (fix or feature that would change existing functionality)

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

#### Description
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Fix invalid JSON returned by stats.fetch with multiple modules as parameter.

Cleanup by reducing code duplication.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2537

-- Commit Summary --

  * kex: Make stats.fetch(n) reply with valid JSON
  * kex: Remove a lot of duplicate code from rpc_stats_fetch*
  * kex: Let the RPC server do printf as it may have optimizations

-- File Changes --

    M src/modules/kex/core_stats.c (222)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2537.patch
https://github.com/kamailio/kamailio/pull/2537.diff

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