security/vuxml: Mark zeek < 5.0.1 as vulnerable as per:

https://github.com/zeek/zeek/releases/tag/v5.0.1

The potential DoS vulnerabilities include:

• Fix a possible overflow and crash in the ARP analyzer when receiving a specially crafted packet.
• Fix a possible overflow and crash in the Modbus analyzer when receiving a specially crafted packet.
• Fix two possible crashes when converting IP headers for output via the raw_packet event.
• Fix an abort related to an error related to the ordering of record fields when processing DNS EDNS headers via events

Reported by: Tim Wojtulewicz