Set inp address, port and rtable together with inpcb hash.

Set inp address, port and rtable together with inpcb hash.

The inpcb hash table is protected by table->inpt_mtx.  The hash is
based on addresses, ports, and routing table.  These fields were
not sychronized with the hash.  Put writes and hash update into the
same critical section.
Move the updates from ip_ctloutput(), ip6_ctloutput(), syn_cache_get(),
tcp_connect(), udp_disconnect() to dedicated inpcb set functions.
There they use the same table mutex as in_pcbrehash().
in_pcbbind(), in_pcbconnect(), and in6_pcbconnect() need more work
and are not included yet.

OK sashan@ mvs@