Add a -P option to allow skipping newfs when using a vnode-backed

disk. Apparently some people want to use mdmfs as mount_* as a
shortcut for mounting existing file-based file systems.

Note that unlike in the patches from the submitters, this option is
not available in compat mode. Compat mode was supposed to support only
things that mount_mfs used to support. To use this option from fstab,
mdmfs should be called mount_md, not mount_mfs. This distinction has
not always upkept for new options, and those can't be fixed now
without breaking people's systems, but new options should not usually
be allowed in compat mode. (Not sure why -F is allowed there at all.)

PR:		57641
Submitted by:	Ruben de Groot
Submitted independently by: Wojciech A. Koszek, for Urzad Miasta Czestochowa

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