For the jail case we are already looping over the interface addresses
before falling back to the only IP address of a jail in case of no
match. This is in preparation for the upcoming multi-IPv4/v6/no-IP
jail patch this change was developed with initially.
This also changes the semantics of selecting the IP for processes within
a jail as it now uses the same logic as outside the jail (with additional
checks) but no longer is on a mutually exclusive code path.
Benchmarks had shown no difference at 95.0% confidence for neither the
plain nor the jail case (even with the additional overhead). See:
http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html
Inpsired by a patch from: Yahoo! (partially)
Tested by: latest multi-IP jail patch users (implictly)
Discussed with: rwatson (general things around this)
Reviewed by: mostly silence (feedback from bms)
Help with benchmarking from: kris
MFC after: 2 months
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