Import upstream changesets for the output of the "zpool" command:
Import upstream changesets for the output of the "zpool" command:

952 separate intent logs should be obvious in 'zpool iostat' output
1337 `zpool status -D' should tell if there are no DDT entries

References:
https://www.illumos.org/issues/952
https://www.illumos.org/issues/1337

Obtained from:	Illumos (issues 952, 1337; changesets 13384, 13432)
MFC after:	1 week

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