OpenSSl 1.1.0 support

- improve renegotiation loop.
  Should now also work in case only the
  cipher changes.
  Should now also work in case the handshake
  ends with an error.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1729498 13f79535-47bb-0310-9956-ffa450edef68