Simple REST API call samples has been added.

* it could be removed in future;
* it contains jsons for creating both node group and cluster templates.

Change-Id: I13fc834cb11b3f21a02198a3f02334205532bc23

etc/rest-api-samples/cluster_tmpl_create.json

@@ -0,0 +1,25 @@
+{
+    "name": "demo-cluster-template",
+    "description": "Demo Cluster template",
+    "plugin_name": "vanilla",
+    "hadoop_version": "1.1.1",
+    "cluster_configs": {
+        "general": {
+            "some_general_conf": "qwerty"
+        }
+    },
+    "node_groups": [
+        {
+            "name": "master",
+            "node_group_template_id": "9291e73c-0982-4728-820e-0ee77f8e317c",
+            "count": 1
+        },
+        {
+            "name": "worker",
+            "flavor_id": "42",
+            "node_processes": ["tasktracker", "datanode"],
+            "node_configs": {},
+            "count": 2
+        }
+    ]
+}

etc/rest-api-samples/node_group_tmpl_create.json

@@ -0,0 +1,17 @@
+{
+    "name": "test-master-tmpl",
+    "description": "Test template for master node",
+    "flavor_id": "m1.xlarge",
+    "plugin_name": "vanilla",
+    "hadoop_version": "1.1.1",
+    "node_processes": ["tasktracker", "namenode"],
+    "node_configs": {
+        "hdfs": {
+            "some_hdfs_config_1": "value_1",
+            "some_hdfs_config_2": "value_2"
+        },
+        "mapreduce": {
+            "some_mapreduce_config_1": "value_3"
+        }
+    }
+}