Parse nmap vendor name from MAC Address line (filtering out 'Unknown').
Fall back to socket.gethostbyaddr for IPs nmap didn't resolve a hostname
for. Alert label is now: 'hostname (vendor)' | 'hostname' | 'vendor' |
'unknown', in that priority order.
urllib's default Python-urllib user agent is flagged by Cloudflare Bot
Fight Mode (error 1010) when m.example.org homeserver sits behind
Cloudflare. Add a browser-like User-Agent to Matrix PUT/POST requests so
Cloudflare passes the traffic through.