Illumos 4448 - zfs diff misprints unicode characters

4448 zfs diff misprints unicode characters
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Toomas Soome <tsoome@me.com>
Approved by: Matthew Ahrens <mahrens@delphix.com>

References:

https://www.illumos.org/issues/4448
https://github.com/illumos/illumos-gate/commit/b211eb9

Porting Notes:

• [lib/libzfs/libzfs_diff.c]
  • 38145d6 Ensure that zfs diff prints unicode safely.
  • 141b638 Change 3-digit octal escapes to 4-digit ones

Ported-by: kernelOfTruth kerneloftruth@gmail.com
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>