OpenZFS 6410 - teach zdb to perform object lookups by path

Authored by: Yuri Pankov <[email protected]>
Reviewed by: Pavel Zakharov <[email protected]>
Reviewed by: Matthew Ahrens <[email protected]>
Reviewed by: Will Andrews <[email protected]>
Approved by: Dan McDonald <[email protected]>
Ported-by: Brian Behlendorf <[email protected]>

Porting Notes:
- Replaced zdb.8 with upstream mdoc zdb.1m version.  Updated to
  include Linux specific features: -V verbatium imports and
  improved label printing (-u, and -l).
- Minor changes to `zdb -h` output to honor 80 character limit.

OpenZFS-issue: https://www.illumos.org/issues/6410
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/ed61ec1
Closes #6006 

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