Make Windows drive instance domain code less chatty.
Make Windows drive instance domain code less chatty.

Turns out there are situations (multi-path IO) where
Windows drivers freak out and create disk devices in
PDH land that have nonsense names like "17" and "17#".
Handle it better, by still ignoring them - just don't
want to fill the pmcd log with that chatter.

http://support.microsoft.com/kb/974878 has the details,
thanks to Rodney McKee for finding this one.

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