pkt_sched: sch_hfsc: sch_htb: Add non-work-conserving warning handler.

pkt_sched: sch_hfsc: sch_htb: Add non-work-conserving warning handler.

Patrick McHardy <[email protected]> suggested:
> How about making this flag and the warning message (in a out-of-line
> function) globally available? Other qdiscs (f.i. HFSC) can't deal with
> inner non-work-conserving qdiscs as well.

This patch uses qdisc->flags field of "suspected" child qdisc.

Signed-off-by: Jarek Poplawski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>