storage: Add param to check whether we can write a disk label
Modify virStorageBackendDiskValidLabel to add a 'writelabel' parameter. While initially for the purpose of determining whether the label should be written during DiskBuild, a future use during DiskStart could determine whether the pool should be started using the label found. Augment the error messages also to give a hint as to what someone may need to do or why the command failed.
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