[TCP]: Add TCP Vegas congestion control module.

TCP Vegas code modified for the new TCP infrastructure.
Vegas now uses microsecond resolution timestamps for
better estimation of performance over higher speed links.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/ipv4/Kconfig
Simple merge

diff --cc net/ipv4/Makefile
Simple merge

diff --cc net/ipv4/tcp_vegas.c
Simple merge