MFC r230397, r230438, r232064:

MFC r230397, r230438, r232064:

MFC r230397 (pjd):
By default turn off prefetch when listing snapshots.
In my tests it makes listing snapshots 19% faster with cold cache and
47% faster with warm cache.

MFC r230438 (pjd):
Dramatically optimize listing snapshots when user requests only snapshot
names and wants to sort them by name, ie. when executes:

	# zfs list -t snapshot -o name -s name

Because only name is needed we don't have to read all snapshot properties.

Below you can find how long does it take to list 34509 snapshots from a single
disk pool before and after this change with cold and warm cache:

before:

	# time zfs list -t snapshot -o name -s name > /dev/null
	cold cache: 525s
	warm cache: 218s

after:

	# time zfs list -t snapshot -o name -s name > /dev/null
	cold cache: 1.7s
	warm cache: 1.1s

MFC r232064:
Import illumos changeset 13608 [1]:

add support for "-t <datatype>" argument to zfs get

References:
https://www.illumos.org/issues/1936

Update zfs(8) manpage in respect of [1].
Fix typo in zfs(8) manpage.

Obtained from:	illumos (issue #1936) [1]

git-svn-id: svn://svn.freebsd.org/base/stable/8@233862 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f