create disk.local the same way ephemerals are created (LP: #851145)
If the user did not specify '--block-device-mapping /dev/vdb=ephemeral0', then the first non-root device would end up being created differently then if they had. It would not have a filesystem on it. This makes 'local_gb' in the libvirt connection created the same way that it would be if it were named ephemeral0.
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