libzfs: const'ify path argument to zfs_path_to_zhandle

zfs_path_to_zhandle has no need to mutate the path argument,
most notably:

- zfs_open takes path as const
- getextmntent takes path as const
- fprintf most clearly doesn't need to mutate it

It's hard to foresee any reason that libzfs could conceivably
want to mutate it in the future, either, so const'ify it.

Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: Matt Ahrens <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Kyle Evans <[email protected]>
Closes #10605 

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