Migrate SSL functionality out of service and into listener. Develop config handling accordingly, including making provision for SSL parameters in servers for future use in implementing SSL to backend servers. Some elements still to be tidied mainly in mysql_client.c - but that will be part of detaching the SSL authentication from the MySQL protocol.

server/include/dcb.h

@@ -20,6 +20,7 @@
 #include <spinlock.h>
 #include <buffer.h>
 #include <gw_protocol.h>
+#include <gw_ssl.h>
 #include <modinfo.h>
 #include <gwbitmask.h>
 #include <skygw_utils.h>
@@ -201,6 +202,7 @@ typedef struct dcb
     char            *protoname;     /**< Name of the protocol */
     void            *protocol;      /**< The protocol specific state */
     struct session  *session;       /**< The owning session */
+    SSL_LISTENER    *listen_ssl;    /**< For a client DCB, the SSL descriptor, if any */
     GWPROTOCOL      func;           /**< The functions for this descriptor */
 
     int             writeqlen;      /**< Current number of byes in the write queue */