Small change to bictcp based on the BIC 1.1 patches for web100.
Keep track of last time congestion was computed, and recompute
if cwnd changes or every 1/32 of a second.

Also changes the initialization location for the parameters.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@redhat.com>