MFC of ZFS Warning Removal.

Not that this is inconvienent but is this planned on being MFC'd to stable/{6,7} 
as well ?.

- Thanks

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r197221 | pjd | 2009-09-15 08:21:06 -0400 (Tue, 15 Sep 2009) | 7 lines

MFC r197218:

We believe ZFS is ready for production use. Remove a warning about it being
experimental. :)

Approved by:    re (kib)
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