illumos gate

Picking update from OpenZFS:

commit 5d6a46036277e472433416dda06a0299c339ae08
Author: Brian Behlendorf <behlendorf1@llnl.gov>
Date:   Fri May 29 09:27:03 2015 -0700

    Unify mount and share for 'zfs create/clone'

    Both the 'zfs create' and 'zfs clone' commands are expected to
    automatically mount and share new filesystems.  Since this is common
    functionality it has been moved in to a shared helper function.

    Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
    Closes #3459

This update will prepare ground for draid support. While there, update history with zfs_do_clone and zfs_d_create.