Add wireshark advisories

[anemec-rh]

Wireshark advisories often come in large numbers and take a lot of time to file. I would really like if we had an option to parse these advisories similarly to what we already do with mysql/chrome/flash.

They are written in a way which allows nice parsing, and we already used to do that with upstream-advisory-manager.

Sample advisory:
https://www.wireshark.org/security/wnpa-sec-2018-38.html