zfs: add missing checks for unsupported features

zfs: add missing checks for unsupported features

After the merge of OpenZFS master-9312e0fd1 it has become possible to
import ZFS pools witn an active org.illumos:edonr feature on FreeBSD,
leading to a panic.

In addition, "zpool status" reported all pools without edonr as upgradable
and "zpool upgrade -v" lists edonr in the list of upgradable features.

This is an accepted but not yet included bugfix by upstream.

Obtained from:		https://github.com/openzfs/zfs/pull/11653
Differential Revision:	https://reviews.freebsd.org/D28935
Reported by:		garga (on freebsd-current@)
Reviewed by:		freqlabs

(cherry picked from commit c170aa9f37e4ce9338a0f26e3e983f7123ea8c1a)