Changes to PCBPORTHASH wrt TCP, review needed

The attached patch is rather short, but makes a substantial change in how ports are bound, so I'd like a quick review of the code and the concept if possible. In short, what this patch does is remove established TCP connections from the PCBPORTHASH table, thereby allowing their ephemeral ports to

Current problem reports assigned to you

Current FreeBSD problem reports Critical problems Serious problems Non-critical problems S Submitted Tracker Resp. Description --- o [2002/05/04] kern/37761 net process exits but socket is still ESTAB