Exclude SSLv2 and SSLv2Hello.

Add exclude rules for SSLv2 and SSLv2Hello.

```cmd
java -jar target/winstone-2.8-SNAPSHOT.jar --warfile=/home/schristou/Downloads/jenkins.war --httpsPort=4430
.......
INFO: Enabled Protocols [TLSv1, TLSv1.1, TLSv1.2] of [SSLv2Hello, SSLv3, TLSv1, TLSv1.1, TLSv1.2]
```