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

[rhys-hanrahan]

Some things I am concerned about/would like feedback on if possible:
* Right now I'm using DNS caching but would like to not use this if possible, because it would delay how long it takes for Kamailio to know when active IPs change. I am just not sure if using `_resolvehost()` to find local IPs on each call is too heavy or not?
* I am not sure if any other code would be caching results based on `grep_host_info` and expecting they never change? This is the only scenario I can see causing problems in future, but I can't see anywhere in the code where this is happening.

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