: ktime clocksource + hrtimer

These patches convert the packet schedulers to use ktime as only clock source and kill off the manual clock source selection. Additionally all packet schedulers are converted to use hrtimer-based watchdogs, greatly increasing scheduling precision.

I've tested HFSC, HTB, TBF and netem. CBQ is untested since I never managed to get it running properly even without these patches.

I have a number of follow-up cleanup patches that get rid of most of the remaining PSCHED_* macros, I'll send them once these patches have been merged.

Please apply, thanks.

 include/net/pkt_sched.h |  182 ++++++------------------------------------------
 kernel/hrtimer.c        |    1 
 net/sched/Kconfig       |   56 --------------
 net/sched/sch_api.c     |  113 ++++++++++-------------------
 net/sched/sch_cbq.c     |  100 ++++++++++++--------------
 net/sched/sch_hfsc.c    |   75 ++++---------------
 net/sched/sch_htb.c     |   93 ++++++++----------------
 net/sched/sch_netem.c   |   25 +-----
 net/sched/sch_tbf.c     |   31 +-------
 9 files changed, 171 insertions(+), 505 deletions(-)

Patrick McHardy:
[NET_SCHED]: Use ktime as clocksource
[NET_SCHED]: Add hrtimer based qdisc watchdog [NET_SCHED]: sch_hfsc: use hrtimer based watchdog [NET_SCHED]: sch_tbf: use hrtimer based watchdog [NET_SCHED]: sch_netem: use hrtimer based watchdog [NET_SCHED]: sch_cbq: use hrtimer based watchdog [NET_SCHED]: sch_cbq: fix cbq_undelay_prio for non-active priorites [NET_SCHED]: sch_cbq: use hrtimer for delay_timer [NET_SCHED]: sch_htb: use hrtimer based watchdog [NET_SCHED]: kill jiffie conversion macros