pkt_sched: Revert tasklet_hrtimer changes.

pkt_sched: Revert tasklet_hrtimer changes.

These are full of unresolved problems, mainly that conversions don't
work 1-1 from hrtimers to tasklet_hrtimers because unlike hrtimers
tasklets can't be killed from softirq context.

And when a qdisc gets reset, that's exactly what we need to do here.

We'll work this out in the net-next-2.6 tree and if warranted we'll
backport that work to -stable.

This reverts the following 3 changesets:

a9f315cab1515b845503ebd366f69065bca87b15
("pkt_sched: Fix bogon in tasklet_hrtimer changes.")

11010340b9b770af15fdfc9a15a575914e1c6114
("pkt_sched: Convert CBQ to tasklet_hrtimer.")

7ed5d9f09025fb269744ef0a326eb767b879f859
("pkt_sched: Convert qdisc_watchdog to tasklet_hrtimer")

Signed-off-by: David S. Miller <davem@davemloft.net>