Convert the allowed characters '-', '.', and ':' in a ZFS pool name to _ to avoid causing errors in the shell script.
Convert the allowed characters '-', '.', and ':' in a ZFS pool name to _
to avoid causing errors in the shell script.

Submitted by:	William Grzybowski <william88@gmail.com>
Approved by:	kib (mentor)
MFC after:	7 days
Sponsored by:	iXsystems

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