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.

merged from trunk r1483866


git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.22@1484433 13f79535-47bb-0310-9956-ffa450edef68