MFC r305221: MFV r302992: 7071 lzc_snapshot does not fill in errlist on ENOENT

illumos/illumos-gate@25f7d993adbfb3452ac4625b3791670746d35ae3
https://github.com/illumos/illumos-gate/commit/25f7d993adbfb3452ac4625b379167074
6d35ae3

https://www.illumos.org/issues/7071

upstream
DLPX-40482 lzc_snapshot does not fill in errlist on ENOENT

Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Author: Matthew Ahrens <mahrens@delphix.com>