Fallback to the "first node" configuration

If a node's configuration can't be loaded (e.g. nodeX/node.cnf is missing), fall-back and load the "first node" (e.g. Node1) configuration. On recent *nix installs (since the migration to Git), the node2+/node.cnf files were not copied/created, so let's solve that soon-to-be-FAQ now.