2882 implement libzfs_core
2883 changing "canmount" property to "on" should not always remount dataset
2900 "zfs snapshot" should be able to create multiple, arbitrary snapshots at once
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Chris Siden <christopher.siden@delphix.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Bill Pijewski <wdp@joyent.com>
Reviewed by: Dan Kruchinin <dan.kruchinin@gmail.com>

*** 37,47 ****
  .fi
  
  .LP
  .nf
  \fBzfs\fR \fBsnapshot\fR [\fB-r\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR]...
!       \fIfilesystem@snapname\fR|\fIvolume@snapname\fR
  .fi
  
  .LP
  .nf
  \fBzfs\fR \fBrollback\fR [\fB-rRf\fR] \fIsnapshot\fR
--- 37,47 ----
  .fi
  
  .LP
  .nf
  \fBzfs\fR \fBsnapshot\fR [\fB-r\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR]...
!       \fIfilesystem@snapname\fR|\fIvolume@snapname\fR...
  .fi
  
  .LP
  .nf
  \fBzfs\fR \fBrollback\fR [\fB-rRf\fR] \fIsnapshot\fR
*** 1835,1861 ****
  
  .sp
  .ne 2
  .na
  \fB\fBzfs snapshot\fR [\fB-r\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ...
! \fIfilesystem@snapname\fR|\fIvolume@snapname\fR\fR
  .ad
  .sp .6
  .RS 4n
! Creates a snapshot with the given name. All previous modifications by
! successful system calls to the file system are part of the snapshot. See the
! "Snapshots" section for details.
  .sp
  .ne 2
  .na
  \fB\fB-r\fR\fR
  .ad
  .sp .6
  .RS 4n
! Recursively create snapshots of all descendent datasets. Snapshots are taken
! atomically, so that all recursive snapshots correspond to the same moment in
! time.
  .RE
  
  .sp
  .ne 2
  .na
--- 1835,1860 ----
  
  .sp
  .ne 2
  .na
  \fB\fBzfs snapshot\fR [\fB-r\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ...
! \fIfilesystem@snapname\fR|\fIvolume@snapname\fR\fR...
  .ad
  .sp .6
  .RS 4n
! Creates snapshots with the given names. All previous modifications by
! successful system calls to the file system are part of the snapshots.
! Snapshots are taken atomically, so that all snapshots correspond to the same
! moment in time. See the "Snapshots" section for details.
  .sp
  .ne 2
  .na
  \fB\fB-r\fR\fR
  .ad
  .sp .6
  .RS 4n
! Recursively create snapshots of all descendent datasets
  .RE
  
  .sp
  .ne 2
  .na