log messages which fail signature validation

lib/hk-util.js

@@ -963,7 +963,11 @@ HK.onChannelMessage = function (Env, Server, channel, msgStruct, cb) {
                 // validation can fail in multiple ways
                 if (err === 'FAILED') {
                     // we log this case, but not others for some reason
-                    Log.info("HK_SIGNED_MESSAGE_REJECTED", 'Channel '+channel.id);
+                    Log.info("HK_SIGNED_MESSAGE_REJECTED", {
+                        channel: channel.id,
+                        validateKey: metadata.validayKey,
+                        message: signedMsg,
+                    });
                 }
                 // always abort if there was an error...
                 cb('FAILED_VALIDATION');