add generic size table for qdiscs

Patch adds generic size table that is similiar to rate table, with
difference that size table stores link layer packet size.

Based on patch by Patrick McHardy
 http://marc.info/?l=linux-netdev&m=115201979221729&w=2

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Stephen Hemminger <stephen.hemminger@vyatta.com>
8 files changed