Suricata

Found by oss-fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38649

ConfNodeLookupChild iterates over the whole list to check if a node is already present
If we are adding many sequences, this leads to quadratic complexity.
When adding node 10000, we check if the first 9999 nodes are names 10000