Improve the TLS connection

[LecrisUT]

Short description:

Currently TLS connection is only tested on port 465, and it continues with failover to insecure connection. The latter can be a MIM attack risk.

Features to implement:

• Allow for user settings on a per-domain basis whether the TLS test has to pass or not.
• Perform a TLS test on the custom port (2525) as well with the same failover settings as above

Bonus:

• Allow users to add self-signed certificates for specific domains.