Bug#4114 - mod_tls should not support SSLv3 by default.
When a user configures a single protocol, e.g. "TLSProtocol TLSv1", make
sure that we explicitly disable all of the other supported versions.
Merge pull request #56 from proftpd/tls-sslv3-disabled-bug4114

Bug#4114 - mod_tls should not support SSLv3 by default.