[tz] Google public NTP servers to 'smear' leap seconds.

[Paul Eggert]

Tony Finch wrote:
> When I did a survey of leap smear schemes in September, only Amazon was
> doing -12 to +12 smear.

Amazon has 10x the capacity of the next dozen cloud service competitors, 
according to Gartner. Microsoft (which Gartner says is #2) also uses a 24-hour 
smear, according to Google. So to some extent Google may be saying that it'll 
bow to the market leaders.

> It's probably worth noting that ntpd now has an open implementation of
> leap smear.

Thanks, proposed patch attached. This also tones down the wording a bit, 
responding to John Hawkinson's comments (which I plan to reply to shortly).
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