OpenZFS 8965 - zfs_acl_ls_001_pos fails due to no longer supported grep regex

The test used \> to detect the end of a string, but this no longer works,
so use $ which works as well since the string ends the line anyway.

Authored by: John Wren Kennedy <john.kennedy@delphix.com>
Reviewed by: Akash Ayare <aayare@delphix.com>
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Yuri Pankov <yuripv@icloud.com>
Reviewed by: Igor Kozhukhov <igor@dilos.org>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Approved by: Dan McDonald <danmcd@joyent.com>
Ported-by: Giuseppe Di Natale <dinatale2@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/8965
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/cb1204e444
Closes #7145