Disable SSLv3 (POODLE)

Related: #3131

Motivation:

To prevent users from accidentally enabling SSLv3 and making their
services vulnerable to POODLE, disable SSLv3 when SSLEngine is
instantiated via SslContext.

Modification:

- Disable SSLv3 for JdkSslContext and OpenSslServerContext

Result:

Saner default set of protocols