kernel - Force NFSv3 for diskless nfs mount
* Ignore any file handles passed from bootp. These are NFSv2 handles
and NFSv2 just doesn't have the directory support needed if the
server is running a filesystem with 64-bit directory cookies (as HAMMER
does).
This will force the kernel's diskless nfs mount to re-authorize and
acquire a NFSv3 handle for the root mount.
* Undo a bit of a previous commit where I tried to enable readdirplus for
NFSv2 to workaround NFSv2 directory cookie issues. It just doesn't work.
readdirplus is again force-disabled for NFSv2 mounts.