Fix generation of clusters via 'genEmptyCluster'
The current uniqueness algorithm (generate random node names, suffix them with node index) is actually wrong: a node named "21" at index 5 will end up with the same name as a node named "2" at position 15. To fix this, we also add a character from a different "set" ("-"), so that such mixups can't happen again, and also add an explicit check for it. Signed-off-by: Iustin Pop <email@example.com> Reviewed-by: Michael Hanselmann <firstname.lastname@example.org>
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