[Libguestfs] [PATCH nbdkit] vddk: Demote another useless phone-home error message to debug

[Richard W.M. Jones]

I pushed this as commit 270ee75ede3881f32a7c21264676851dcf0969be.
I was finally able to test the change myself.  It requires a very
specific set of circumstances detailed in the BZ.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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