conf: snapshot: Avoid autogenerating duplicate snapshot names
The snapshot name generator truncates the original file name after a '.' and replaces the suffix with the snapshot name. If two disks source images differ only in the suffix portion, the generated name will be duplicate. Since this is a corner case just error out stating that a duplicate name was generated. The user can work around this situation by providing the file names explicitly. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1283085
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