Update the appropriate configurations to enforce one's SSLProtocol requirements

[Eric Desrochers]

[FEATURE REQUEST]

Update the appropriate configurations to enforce one's SSLProtocol requirements base on internal security policies.

For instance, one whom would like to enforce TLSv1.2.

[Alex Kavanagh (ajkavanagh)]

Triaged as wishlist. This is not to say that it's not an important feature. Thank you for the suggestion for additions to the charm and core library.