Improve MySQL detection

[0xA50C1A1]

Please sign (check) the below before submitting the Pull Request:

• I have signed the ntop Contributor License Agreement at https://github.com/ntop/legal/blob/main/individual-contributor-licence-agreement.md
• I have read the contributing guide lines at https://github.com/ntop/nDPI/blob/dev/CONTRIBUTING.md
• I have updated the documentation (in doc/) to reflect the changes made (if applicable)

Describe changes:

Slight improvement of MySQL dissector: added MariaDB support and more stringent checks.

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[0xA50C1A1]

@IvanNardi @utoni guys, what do you think about this? I bumped the minimum MySQL version in check from 1 to 4 since there's not many people using these ancient relics.

Well, also authentication plugin support was introduced only in MySQL 4, if memory serves me right.

[IvanNardi]

Thanks