Security: Remove support for SSLv3

For reference please read:
https://community.qualys.com/blogs/securitylabs/2014/10/15/ssl-3-is-dead-killed-by-the-poodle-attack
https://blog.cloudflare.com/sslv3-support-disabled-by-default-due-to-vulnerability/
https://scotthelme.co.uk/sslv3-goes-to-the-dogs-poodle-kills-off-protocol/