#64 CFS doesn't support mandatory locks

[David Zafman]

We don't support mandatory locks right now. Since the
"mand" mount option is not the default as far as I
know, this isn't a critical bug.

I don't like that fact that we don't fail to mount if
the option is specified for a CFS mount.

[David Zafman]

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Let's put in a fix top fail the "mand" option, then move
this to a feature request.