[PATCH, needs new owner] agskip mount option

[Lachlan McIlroy]

This patch provides a new mount option, agskip=N, that tells the XFS allocator
to skip over X many AGs when selecting an initial AG for data extent allocations
for a new file.  This option is particularly useful when the volume layout is a
series of concat units - just set N to be the number of AGs in a concat and data
allocations will then be load balanced over the spindles.
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