[PATCH] Default scrub interval to whole weeks

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Hi,

I think it might be better if we set scrub interval to whole weeks
(proposed changeset changes it to 5 weeks).

The reason for this is to make it easier for system administrators to
estimate when the scrub happens, for instance, if a scrub was done on
Saturday, it always happen on Saturdays.  On large zpools, scrub can
consume a lot of time and I/O bandwidth, and having it happen on
random weekday is not a good idea.

Cheers,
- -- 
Xin LI <delphij_at_delphij.net>	https://www.delphij.net/
FreeBSD - The Power to Serve!		Live free or die
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