FreeNAS/freenas ddac369src/middlewared/middlewared/plugins zfs.py

Remove zfs cli usage

This commit removes zfs cli usage as py-libzfs is giving us better/same results when we opt out of retrieving any property for a dataset. It also exposes a knob to disallow/allow retrieving custom user props for datasets.
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+19-36src/middlewared/middlewared/plugins/zfs.py
+19-361 files

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