Tidy up more log messages

core/message_area.js

@@ -363,7 +363,7 @@ function changeMessageConference(client, confTag, cb) {
             if (!err) {
                 client.log.info(
                     { confTag: confTag, confName: conf.name, areaTag: areaInfo.areaTag },
-                    'Current message conference changed'
+                    `${client.node} changed message conference to ${areaInfo.areaTag}`
                 );
             } else {
                 client.log.warn(
@@ -412,9 +412,9 @@ function changeMessageAreaWithOptions(client, areaTag, options, cb) {
         ],
         function complete(err, area) {
             if (!err) {
-                client.log.info(
+                client.log.debug(
                     { areaTag: areaTag, area: area },
-                    'Current message area changed'
+                    `Node ${client.node} changed message area to ${areaTag}`
                 );
             } else {
                 client.log.warn(