jsse: Make sure we use TLSv1.2 as the default protocol.

We should at least try to use TLSv1.2 if the server supports it and do
not use error prone versions of the protocol.

https://community.qualys.com/blogs/securitylabs/2013/09/10/is-beast-still-a-threat

Change-Id: Ic1faad2bb1dd526930c4c5280d0851cbc8087047