Fix broken policy translation

The current policy translation implementation is not working and missing a
test that tests actual translation.

Change-Id: I31f792000810678e6342e95ac9e9a26fa6ac1c61
Closes-Bug: 1552299

translator/hot/syntax/hot_resource.py

@@ -319,6 +319,9 @@ class HotResource(object):
             operations[operation.name] = operation
 
         node_type = node.type_definition
+        if isinstance(node_type, str) or \
+            node_type.type == "tosca.policies.Placement":
+                return operations
 
         while True:
             type_operations = HotResource._get_interface_operations_from_type(
@@ -334,6 +337,9 @@ class HotResource(object):
     @staticmethod
     def _get_interface_operations_from_type(node_type, node, lifecycle_name):
         operations = {}
+        if isinstance(node_type, str) or \
+            node_type.type == "tosca.policies.Placement":
+                return operations
         if node_type.interfaces and lifecycle_name in node_type.interfaces:
             for name, elems in node_type.interfaces[lifecycle_name].items():
                 # ignore empty operations (only type)

translator/tests/data/hot_output/hot_policies.yaml

@@ -1,20 +1,16 @@
 heat_template_version: 2013-05-23
 
 description: >
-  Template for deploying a single server with predefined properties.
+  Template for deploying the nodes based on given policies.
+
+parameters: {}
 
-parameters:
-  receiver_port:
-    type: string
-    description: Port to be used for receiving messages.
-    default: 1
 resources:
   my_server:
     type: OS::Nova::Server
     properties:
       flavor: m1.medium
       image: rhel-6.5-test-image
-      key_name: userkey
       scheduler_hints:
         group:
           get_resource: my_compute_placement_policy
@@ -25,4 +21,5 @@ resources:
       name: my_compute_placement_policy
       policies:
       - affinity
-outputs: {}
+
+outputs: {}

translator/tests/test_tosca_hot_translation.py

@@ -621,3 +621,13 @@ class ToscaHotTranslationTest(TestCase):
                                                                    params)
         self.assertEqual({}, diff, '<difference> : ' +
                          json.dumps(diff, indent=4, separators=(', ', ': ')))
+
+    def test_hot_translate_policy(self):
+        tosca_file = '../tests/data/tosca_policies.yaml'
+        hot_file = '../tests/data/hot_output/hot_policies.yaml'
+        params = {}
+        diff = TranslationUtils.compare_tosca_translation_with_hot(tosca_file,
+                                                                   hot_file,
+                                                                   params)
+        self.assertEqual({}, diff, '<difference> : ' +
+                         json.dumps(diff, indent=4, separators=(', ', ': ')))