use for to avoid multiple callback calls

lib/contracts/deploy_manager.js

@@ -118,7 +118,7 @@ class DeployManager {
         }
 
         // TODO: convert to for to avoid repeated callback
-        onDeployCode.forEach((cmd) => {
+        for(let cmd of onDeployCode) {
           self.logger.info("executing: " + cmd);
           try {
             RunCode.doEval(cmd, web3);
@@ -128,7 +128,7 @@ class DeployManager {
             }
             return callback(new Error(e));
           }
-        });
+        }
 
         callback(null, contractsManager);
       }