sysutils/zap: Update to version 0.6.1.

Changes in version 0.6.0:

• Add remote replication support.
• Rework command options to be similar to the zfs command.

Changes in version 0.6.1:

• Fix incorrect replication example in the documentation.

Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D9043