Review of patch for raw packet source address selection under jails

[Steven Hartland]

Currently source address selection for raw packets under jails
uses prison_get_ip4 in the INADDR_ANY case.

This can cause an invalid source address to be used, including
using addresses which are unusable e.g. down interfaces
un-routable addresses etc.

I suspect this is a hang over from when jails where essentially
single IP.

The attached patch switches to use full resolution for raw
packets via in_pcbladdr, which fixes this problem in all of 
our testing.

Is this the correct path to take?

    Regards
    Steve

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