[Bug 190462] request: don't active feature flags when upgrading zfs pool

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=190462

--- Comment #2 from Allan Jude <allanjude at FreeBSD.org> ---
This is not really a concern. Most all features can be in the 'enabled' state,
and still be imported by older versions of ZFS. It is the 'active' state, that
means one or more datasets is currently using that feature, and that a system
requires that feature in order to read the data. Destroying the last dataset
that is using that feature (for example, the skein hashing algo), will revert
that feature to 'enabled', and the pool can be imported on a system without
that feature.

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