mod_ssl_ct: Work with current Certificate Transparency tools (e.g., as of certificate-transparency commit 3f03188fe89974d45345fddee64a8227bd2ec26a) The interface to the "ct" tool now requires the log's URL and public key, resulting in a bit of refactoring in the module.

Add message numbers to mod_ssl_ct messages with severity > debug.

Follow-up to r1588987: Fix doc and code confusion about the trust/distrust flag; 1 is distrust, 0 or NULL/- is trust.

Add module mod_ssl_ct, which provides an implementation of Certificate Transparency (RFC 6962) for httpd. mod_ssl_ct requires OpenSSL 1.0.2 (in beta) and must be explicitly enabled via configure. Note that support/ctauditscts is purposefully not installed; it does not properly function due to a dependency on a certificate-transparency open source project tool which itself is not sufficiently complete at this time.