Add ability to specify multiple apps to run on each node

refs: #2933

Change-Id: Ic5d47bb3e9ab830f01b55be37848aa680174cf32
diff --git a/bin/minindn b/bin/minindn
index 2699bfd..9b183a0 100755
--- a/bin/minindn
+++ b/bin/minindn
@@ -200,8 +200,10 @@
 
     for host in net.hosts:
         if 'app' in host.params:
-            if host.params['app'] != '_':
-                host.cmd(host.params['app'])
+            if host.params['app'] != '':
+                app = host.params['app']
+                print "Starting " + app + " on node " + host.name
+                print(host.cmd(app))
 
     # Load experiment
     if experimentName is not None: