Add use_router to Tutorials 16 and 17 configurations (#19)

* added use_router example to 16 config

* added routerless to 17

Author: emaicus

examples/16_docker_network_python/config/config.json

@@ -1,4 +1,6 @@
 {
+    //States that a given testcase uses a router by default. (Default value is true)
+    "use_router" : true,
     // docker_enabled must be true in order for networking to work. If you forget it,
     // your assignment should fail to build.
     "docker_enabled" : true,
@@ -10,6 +12,8 @@
 
         // *************** TEST CASES *****************
         {
+            //Despite the default being true, this testcase will not use a router.
+            "use_router" : false,
             "title" : "Ping Pong",
             "containers" : [
                 {

examples/17_dispatched_actions_and_standard_input/config/config.json

@@ -2,6 +2,7 @@
   "autograding" : {
     "work_to_details" : ["**/*.txt"]
   },
+  "use_router" : false,
   "docker_enabled" : true,
   "testcases" : [
     {
@@ -17,10 +18,6 @@
         },
         {
           "commands" : [ "python3 solution.py" ]
-        },
-        {
-          "container_name" : "router",
-          "commands" : [ "python3 router.py" ]
         }
       ],