ntpfrob: stepback for RS6000

[Hal Murray]

ghane0 at gmail.com said:
> I suggest that ntpfrob drop support for testing for this bug.  I will clean
> up related docs, and review tests, as well, and submit a PR on Github for
> review. 

Sounds good to me.

I took a quick look at the code but didn't figure out what it was trying to 
do.  I may try harder, but it's not high on my list.




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