Tidy up all console.log util.log from core nodes.

Try to make log,warn,error more consistent behaviour.

Especially make sure any existing catches produce errors

nodes/core/storage/28-tail.js

@@ -57,7 +57,7 @@ module.exports = function(RED) {
         });
 
         tail.stderr.on("data", function(data) {
-            node.warn(data.toString());
+            node.error(data.toString());
         });
 
         this.on("close", function() {