Banner-specific signatures (e.g. AdGuard on port 3000) were incorrectly
matching when nmap returned no banner, causing wrong suggested_node_type
(e.g. 'router' for a media server). Now a signature with banner_regex is
only matched when a banner is present AND matches the regex.
Also make _PORT_TYPE_HINTS always contribute to suggest_node_type found set
(not just as elif fallback) so well-known ports like 8006 still resolve to
proxmox even when a generic sig also matched.
Pouzor
2441d72b41