storage: Add writelabel bool for virStorageBackendDeviceProbe
It's possible that the API could be called from a startup path in
order to check whether the label on the device matches what our
format is. In order to handle that condition, add a 'writelabel'
boolean to the API in order to indicate whether a write or just
read is about to happen.
This alters two "error" conditions that would care about knowing.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
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