TCP regression between 288167 and 291456

[Slawa Olhovchenkov]

After upgrading STABLE to r291456 I am see bunch of sockets in
TIME_WAIT state. In normal situation I am expect about 30k-50k such
sockets. Now I am see all of net.inet.tcp.maxtcptw (440k currently).
Setting net.inet.tcp.msl to low value don't reduce this sockets.

I am see socket in TIME_WAIT state during 30 minutes.
Perhapsh in this state socket may be for ever