Add better cluster logs

src/server.js

@@ -15,6 +15,7 @@ if(cluster.isMaster) {
     log.info(`Master ${process.pid} is running`);
 
     const numCPUs = require('os').cpus().length;
+    log.info(`Master will create ${numCPUs} workers`);
     for(let i=0; i < numCPUs; ++i) {
         cluster.fork();
     }
@@ -35,8 +36,8 @@ if(cluster.isMaster) {
     const server = app.listen(app.get('port'), () => {
         log.info(`Express server listening on port ${server.address().port}`);
     });
-    
-    log.info(`Worker ${cluster.worker.id} is running`);
+
+    log.info(`Worker ${cluster.worker.id} is running (${process.pid})`);
 
     // For testing
     module.exports = server;