Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Import the dtrace llquantize test files from the vendor area.

Now that we have an illumos vendor area, import the llquantize
test files directly from there to make it easier to track the
code provenance.

Special thanks to Martin Matuska for populating the illumos
vendor area.

Requested by: obrien

Update illumos/dist to revision 13742:b6bbdd77139c
ZFS bits will follow in a separate commit