merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of im

merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of improvements from upstream,
this version also has these NetBSD-specific enhancements:
- dtrace FBT probes can now be placed in kernel modules.
- ZFS now supports mmap().

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Merge NetBSD local changes to new zfs version 22 sources.

Add NetBSD specific changes to OpenSolaris code. These changes were made
by Andrew Doran and me. Thank you Andrew for your great help.

Oked by core@ and ad@.

Import Opensolaris source code used with zfs port. Zfs code si from date
200811.