QPID-4858: Prevent silent use of insecure HTTP connector when HTTP protocol with SSL transport was requested.

Remove separate HTTPS protocol and use HTTP protocol with SSL transport for consistency with all other protocol types.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1483866 13f79535-47bb-0310-9956-ffa450edef68