[sr-dev] [kamailio/kamailio] core: Add PROXY protocol implementation (#1765)

[Sebastian Lauwers]

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#### 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:
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- [ ] PR should be backported to stable branches
- [x] Tested changes locally
- [x] Related to issue #1757

#### Description
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Note: This PR follows the discussion in #1757.

- introduce new global variable `ksr_tcp_accept_proxy`.
- this variable can be modified by using the `tcp_accept_proxy=yes`
  configuration parameter.
- when active, inbound TCP connections are expected to behave according
  to the PROXY protocol[1].
- Both the v1 (human-readable) and v2 (binary) versions of the protocol
  are supported.

[1]: https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1765

-- Commit Summary --

  * core: Add PROXY protocol implementation

-- File Changes --

    M src/core/cfg.lex (3)
    M src/core/cfg.y (9)
    M src/core/globals.h (1)
    M src/core/tcp_main.c (244)
    M src/core/tcp_read.c (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1765.patch
https://github.com/kamailio/kamailio/pull/1765.diff

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