OpenZFS 7629 - Fix for 7290 neglected to remove some escape sequences

OpenZFS 7629 - Fix for 7290 neglected to remove some escape sequences

Authored by: John Wren Kennedy <john.kennedy@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Porting Notes:
- Multiple changes in this commit were applied in c1d9abf.

OpenZFS-issue: https://www.illumos.org/issues/7629
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/f5fb56d
Closes #5980