[git commit master] ntpd: replace openntp's clock discipline with ntpd's

[Denys Vlasenko]

commit: http://git.busybox.net/busybox/commit/?id=dd6673bac58cebfa9733b142520f17e4a4e2975c
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master

It seems to be much more precise. +2.2k:
   text    data     bss     dec     hex filename
   4670       0       0    4670    123e busybox.t2/networking/ntpd.o
   6838       0       0    6838    1ab6 busybox.t3/networking/ntpd.o

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>

Patch is too large, so refusing to show it