check if wsdd allows traffic amplification attack

[christgau]

WSD implementations (in general) are said to possibly allow traffic amplification attacks. It has to be checked if wsdd is affected by this as well.

References:

• https://blogs.akamai.com/sitr/2019/09/new-ddos-vector-observed-in-the-wild-wsd-attacks-hitting-35gbps.html
• https://www.zdnet.com/article/protocol-used-by-630000-devices-can-be-abused-for-devastating-ddos-attacks/

Even when wsdd is not, some more remarks should be added to the readme/man page: Do not expose to the internet, check firewall rules.