Remove usage of relative_path in ValidationError Objects

* 'relative_path' requires JSONSchema 2.4.0
* Defaults to trying 'relative_path' and falls back to 'path'

Change-Id: Ie8902a3b943ea4e631155ae208aed9d3911c9767
Closes-Bug: #1436261

designate/objects/adapters/api_v2/validation_error.py

@@ -32,9 +32,7 @@ class ValidationErrorAPIv2Adapter(base.APIv2Adapter):
 
     MODIFICATIONS = {
         'fields': {
-            "path": {
-                'rename': 'absolute_path'
-            },
+            "path": {},
             "message": {},
             "validator": {},
             "validator_value": {},

designate/objects/validation_error.py

@@ -16,8 +16,7 @@ from designate.objects import base
 
 class ValidationError(base.DesignateObject):
     FIELDS = {
-        'relative_path': {},
-        'absolute_path': {},
+        'path': {},
         'message': {},
         'validator': {},
         'validator_value': {},
@@ -31,8 +30,7 @@ class ValidationError(base.DesignateObject):
         """
 
         e = cls()
-        e.relative_path = list(js_error.relative_path)
-        e.absolute_path = list(js_error.absolute_path)
+        e.path = list(getattr(js_error, 'releative_path', js_error.path))
         e.message = js_error.message
         e.validator = js_error.validator
         e.validator_value = js_error.validator_value

designate/tests/test_objects/test_base.py

@@ -382,8 +382,7 @@ class DesignateObjectTest(tests.TestCase):
 
         # Ensure the nested ID field has triggered the failure.
         # For some reason testtools turns lists into deques :/
-        self.assertEqual(list(error.absolute_path), ['nested', 'id'])
-        self.assertEqual(list(error.relative_path), ['nested', 'id'])
+        self.assertEqual(error.path, ['nested', 'id'])
 
         # Set the Nested ID field to a valid value
         obj.nested.id = 'ffded5c4-e4f6-4e02-a175-48e13c5c12a0'