[sr-dev] [kamailio/kamailio] core: do not return connection if port does not match (#2307)

[Donato Sciarra]

#### Pre-Submission Checklist
- [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)
- [ ] 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
If kamailio is behind a NAT only return connection if port matches. We observed this issue on an instance after ~10h of operation.

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2307

-- Commit Summary --

  * core: do not return connection if port does not match

-- File Changes --

    M src/core/tcp_main.c (11)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2307.patch
https://github.com/kamailio/kamailio/pull/2307.diff

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