[Bug 1550301] [NEW] ZFS: Set elevator=noop on disks in the root pool

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ZFS-on-Linux has its own I/O scheduler, so it sets the "noop" elevator
on whole disks used in a pool.
https://github.com/zfsonlinux/zfs/issues/90

It does not set the scheduler for a disk if a partition is used in a
pool out of respect for the possibility that there are non-ZFS
partitions on the same disk.
https://github.com/zfsonlinux/zfs/issues/152

For regular pools, the recommendation is to use whole disks. For a root
pools, it's just the opposite. The typical case is that partitions are
used. And, for root pools, it is unlikely that the same disks have non-
ZFS filesystems. Therefore, I think we want to set the "noop" scheduler
for disks in the root pool.

** Affects: zfs-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: patch
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ZFS: Set elevator=noop on disks in the root pool
https://bugs.launchpad.net/bugs/1550301
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