[Bug 221067] vfs.root.mountfrom.options="ro" did not take effect for a zfs root filesystem

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221067

--- Comment #4 from David NewHamlet <wheelcomplex at gmail.com> ---
(In reply to Allan Jude from comment #1)

I hit this issue when trying to use a zfs as rootfs which use a compressed
md_image as underlayer device. A compressed md_image can not be opened in write
mode(see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221066).

So in this case I want to open the whole zfs pool in readonly.

A new kenv entry to control this behavior also make sense.

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