Only use TLS protocol by default when building SSLContext instances

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1632957 13f79535-47bb-0310-9956-ffa450edef68
Do not use TLSv1.1 and TLSv1.2 in SSL tests

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1632966 13f79535-47bb-0310-9956-ffa450edef68