(TK-98) Add test to ensure SSLv3 isn't supported (FOR REVIEW)

Add a test to ensure that SSLv3 isn't supported by TK Jetty9
webservers by default.

I'm throwing this up now for review. However, it depends on https://github.com/puppetlabs/clj-http-client/pull/20 getting merged and clj-http-client getting released so that the dependency can be bumped to a non-SNAPSHOT version.
By default? Or not at all? Is there a way to make it supported, and if so should we have a test for that?