udp6: Remove pcb from wildcard table before calling in_pcbconnect

DragonFly-bug: http://bugs.dragonflybsd.org/issues/2485
if: Update comment about polling cpuid ioctl variables, which is deprecated
sockio: Sort SIOC into numerical order

While im here, add comment about used SIOC in non-continuous SIOC block
ifconfig: IFF_OACTIVE and IFF_POLLING are gone
tcp: Add comment about "fairsend"
TOP wasn't reporting correctly CPU states without -M

Adding code to get averages and updating man page.

This commit fixes issue #2447
tcp: Limit new segements burst to 4 during extended limited transmit