[BUG] Disable TLS1 & TLSv1.1

[stdevPavelmc]

Describe the bug

A user noted (tks @Koratsuki) that we are still allowing TLS v1 & 1.1 and is a major trend to not support it as both are insecure.

More references here

• https://www.packetlabs.net/tls-1-1-no-longer-secure/
• https://www.comodo.com/e-commerce/ssl-certificates/tls-1-deprecation.php
• https://www.acunetix.com/blog/articles/tls-vulnerabilities-attacks-final-part/

A two months data from a online server shown that less than 3% of the connections are using TLSv1 and none are using TLSv1.1 so the impact must be from low to very low...

This in Postfix & Dovecot

[stdevPavelmc]

closed by #111