Enable some volumes v2 tests by sharing codes

1. create volumes v2 tests using the existent test class.
2. create a new test class for v1, which inherits v2.
3. add variable 'special_fields' to deal with the different
   field's name and reps code between v1 and v2.

This patch includes the following volumes tests:
- test_volume_metadata.py
- test_volume_transfers.py
- test_volumes_actions.py
- test_volumes_get.py
- test_volumes_negative.py

Partially implements: blueprint cinder-v2-api-tests

Change-Id: I30b8f38d1f8132ea28266a32d2c9cb912a70e2c3
diff --git a/tempest/api/volume/test_volumes_negative.py b/tempest/api/volume/test_volumes_negative.py
index bc5b1dc..8bd4c88 100644
--- a/tempest/api/volume/test_volumes_negative.py
+++ b/tempest/api/volume/test_volumes_negative.py
@@ -21,15 +21,16 @@
 from tempest import test
 
 
-class VolumesNegativeTest(base.BaseVolumeV1Test):
-    _interface = 'json'
+class VolumesV2NegativeTest(base.BaseVolumeTest):
 
     @classmethod
     @test.safe_setup
     def setUpClass(cls):
-        super(VolumesNegativeTest, cls).setUpClass()
+        super(VolumesV2NegativeTest, cls).setUpClass()
         cls.client = cls.volumes_client
 
+        cls.name_field = cls.special_fields['name_field']
+
         # Create a test shared instance and volume for attach/detach tests
         cls.volume = cls.create_volume()
         cls.mountpoint = "/dev/vdc"
@@ -237,7 +238,7 @@
     @test.attr(type=['negative', 'gate'])
     def test_list_volumes_with_nonexistent_name(self):
         v_name = data_utils.rand_name('Volume-')
-        params = {'display_name': v_name}
+        params = {self.name_field: v_name}
         resp, fetched_volume = self.client.list_volumes(params)
         self.assertEqual(200, resp.status)
         self.assertEqual(0, len(fetched_volume))
@@ -245,7 +246,7 @@
     @test.attr(type=['negative', 'gate'])
     def test_list_volumes_detail_with_nonexistent_name(self):
         v_name = data_utils.rand_name('Volume-')
-        params = {'display_name': v_name}
+        params = {self.name_field: v_name}
         resp, fetched_volume = self.client.list_volumes_with_detail(params)
         self.assertEqual(200, resp.status)
         self.assertEqual(0, len(fetched_volume))
@@ -265,5 +266,14 @@
         self.assertEqual(0, len(fetched_volume))
 
 
-class VolumesNegativeTestXML(VolumesNegativeTest):
+class VolumesV2NegativeTestXML(VolumesV2NegativeTest):
+    _interface = 'xml'
+
+
+class VolumesV1NegativeTest(VolumesV2NegativeTest):
+    _api_version = 1
+    _name = 'display_name'
+
+
+class VolumesV1NegativeTestXML(VolumesV1NegativeTest):
     _interface = 'xml'