Don't go fishing in the stack for the KeyName

The KeyName should be a property of the Instance, and need not have the
same name in the stack parameters.

Change-Id: I05dcfd9aa6f92bc7aaa2dbc594062984ac074b7e
Signed-off-by: Zane Bitter <zbitter@redhat.com>

heat/engine/instance.py

@@ -241,17 +241,20 @@ class Instance(Resource):
         res = Resource.validate(self)
         if res:
             return res
+
         #check validity of key
-        if self.stack.parms['KeyName']:
+        try:
+            key_name = self.properties['KeyName']
+        except ValueError:
+            return
+        else:
             keypairs = self.nova().keypairs.list()
             valid_key = False
             for k in keypairs:
-                if k.name == self.stack.parms['KeyName']:
-                    valid_key = True
-            if not valid_key:
-                return {'Error':
-                        'Provided KeyName is not registered with nova'}
-        return None
+                if k.name == key_name:
+                    return
+        return {'Error':
+                'Provided KeyName is not registered with nova'}
 
     def handle_delete(self):
         try:

heat/tests/test_validate.py

@@ -71,7 +71,7 @@ test_template_ref = '''
       "Properties": {
         "ImageId": "image_name",
         "InstanceType": "m1.large",
-        "KeyName": "test_KeyName"
+        "KeyName": { "Ref" : "KeyName" }
       }
     },
     "DataVolume" : {
@@ -112,7 +112,7 @@ test_template_findinmap_valid = '''
       "Properties": {
         "ImageId": "image_name",
         "InstanceType": "m1.large",
-        "KeyName": "test_KeyName"
+        "KeyName": { "Ref" : "KeyName" }
       }
     },
     "DataVolume" : {
@@ -176,7 +176,7 @@ test_template_findinmap_invalid = '''
         '"InstanceType" }, "Arch" ] } ] },' + \
 '''
         "InstanceType": "m1.large",
-        "KeyName": "test_KeyName"
+        "KeyName": { "Ref" : "KeyName"}
       }
     },
     "DataVolume" : {