debugging pseudo-file - viewing open file list from client

[Aurélien Aptel]

I think we really should have a machine-readable file where we just dump
everything in json or something and let a separate userspace tool filter
and display things.

There are a couple of consumers of the DebugData file (I know of at
least PCP [1] but I'm sure there are others out there) and there's a
high chance they break everytime we change the output.

1: https://pcp.io/
   https://github.com/performancecopilot/pcp/tree/8c9b0442d0c5116d65f432e4c3aff0571f60efb8/src/pmdas/cifs
   
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Aurélien Aptel / SUSE Labs Samba Team
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