setsockopt IP_FREEBIND
Merge https://github.com/znc/znc into fruitiex/ip_freebind
Merge remote-tracking branch 'freebind/fruitiex/ip_freebind'
Revert "Retire awaynick (resolves #661)"

This reverts commit 14e09e1a10a62fd911dbef5da8c7f14346e87c8a.