[sr-dev] [kamailio/kamailio] core: Add virtual flag to listen config to ignore inactive ip addresses (PR #2985)

[rhys-hanrahan]

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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 #2984

#### Description

A new option to "listen" has been added called "virtual". This sets a flag on the listening socket to modify the behaviour of grep_sock_info. When this flag is set, grep_sock_info will only consider the listening IP a match if the IP is found in the system's current list of local IP addresses. If the IP is not currently local, then the matching IP is ignored.

If the virtual flag is not set on the socket then existing behaviour used instead.

This feature is intended for scenarios where you have two Kamailio nodes in active/active setup, with virtual IPs, where you need to be able to listen on a virtual IP but it may not always be active locally. With this flag applied to a `listen=` socket, Kamailio will only consider traffic destined to this IP local, when the IP is actually active on the system, and other times the match is ignored.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2985

-- Commit Summary --

  * core: listen can now have a "virtual" flag to check for nonlocal floating IPs.
  * etc: kamailio.cfg - added example use of listen's new virtual flag.
  * core: Added virtual flag to output of core.sockets_list
  * corex: Added virtual flag to output of "corex.list_sockets"
  * ims_ipsec_pcscf: Added virtual flag to output of sockets list.

-- File Changes --

    M etc/kamailio.cfg (2)
    M src/core/cfg.lex (2)
    M src/core/cfg.y (83)
    M src/core/core_cmd.c (10)
    M src/core/ip_addr.h (1)
    M src/core/socket_info.c (85)
    M src/modules/corex/corex_rpc.c (5)
    M src/modules/ims_ipsec_pcscf/ims_ipsec_pcscf_mod.c (8)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2985.patch
https://github.com/kamailio/kamailio/pull/2985.diff

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