Make the SSL tests run

This patch adds an SSL key set for use during tests and causes the SSL tests to
be run if the server was built with OPENSSL support.  In addition we fix the
TLS port to be bound to 127.0.0.1 which fixes 073's behaviour in SSL mode on an
IPv6 enabled host.

Signed-Off-By: Daniel Silverstone <dsilvers@digital-scurf.org>