* mod_log_config/mod_ssl: moved the log_handlers registered by mod_ssl

  * mod_log_config/mod_ssl: moved the log_handlers registered by mod_ssl
    into mod_log_config itself. These now use the global `ap_ssl_var_lookup()`
    functions and work for all running SSL modules.
    The dependency from mod_ssl to mod_log_config and its header is removed.
    mod_ssl now provides the content of "{errstr}c" as variable "SSL_CLIENT_VERIFY_ERRSTR".
    This change should be fully compatible to all deployed configurations.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1890003 13f79535-47bb-0310-9956-ffa450edef68