merge r1222921 from trunk:

SSLProtocol: allow explicit control of TLSv1.1 and TLSv1.2 flavors when
compiled against OpenSSL 1.0.1 or later. Update documentation.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1222922 13f79535-47bb-0310-9956-ffa450edef68