ZFS channel programs (ZCP) adds support for performing compound ZFS
administrative actions via Lua scripts in a sandboxed environment (with time
and memory limits).
This initial commit includes both base support for running ZCP scripts, and a
small initial library of API calls which support getting properties and
listing, destroying, and promoting datasets.
Testing: in addition to the included unit tests, channel programs have been in
use at Delphix for several months for batch destroying filesystems. The
dsl_destroy_snaps_nvl() call has also been replaced with

For reference, the new zfs-program manpage is included below.
ZFS-PROGRAM(1M)                       1M                       ZFS-PROGRAM(1M)

NAME
     zfs program – executes ZFS channel programs

SYNOPSIS
     zfs program [-t timeout] [-m memory-limit] pool script

DESCRIPTION
     The ZFS channel program interface allows ZFS administrative operations to
     be run programmatically as a Lua script. The entire script is executed
     atomically, with no other administrative operations taking effect
     concurrently. A library of ZFS calls is made available to channel program
     scripts. Channel programs may only be run with root privileges.

     A modified version of the Lua 5.2 interpreter is used to run channel
     program scripts. The Lua 5.2 manual can be found at:

           http://www.lua.org/manual/5.2/
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