OpenZFS 7431 - ZFS Channel Programs

Authored by: Chris Williamson <chris.williamson@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>
Ported-by: Don Brady <don.brady@delphix.com>
Ported-by: John Kennedy <john.kennedy@delphix.com>

OpenZFS-issue: https://www.illumos.org/issues/7431
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/dfc11533

Porting Notes:
* The CLI long option arguments for '-t' and '-m' don't parse on linux
* Switched from kmem_alloc to vmem_alloc in zcp_lua_alloc
* Lua implementation is built as its own module (zlua.ko)
* Lua headers consumed directly by zfs code moved to 'include/sys/lua/'
* There is no native setjmp/longjump available in stock Linux kernel.
  Brought over implementations from illumos and FreeBSD
* The get_temporary_prop() was adapted due to VFS platform differences
* Use of inline functions in lua parser to reduce stack usage per C call
* Skip some ZFS Test Suite ZCP tests on sparc64 to avoid stack overflow

module/Makefile.in

@@ -1,5 +1,6 @@
 subdir-m += avl
 subdir-m += icp
+subdir-m += lua
 subdir-m += nvpair
 subdir-m += unicode
 subdir-m += zcommon
@@ -21,7 +22,7 @@ ZFS_MODULE_CPPFLAGS += @KERNEL_DEBUG_CPPFLAGS@
 
 export ZFS_MODULE_CFLAGS ZFS_MODULE_CPPFLAGS
 
-SUBDIR_TARGETS = icp
+SUBDIR_TARGETS = icp lua
 
 modules:
 	@# Make the exported SPL symbols available to these modules.