Use create_volume classmethod

There is a wrapper utility for volume creation in BaseV2ComputeTest class.

Change-Id: If009b5e28e9e444e4613459515e7c47b754b8bba
diff --git a/tempest/api/compute/volumes/test_volumes_get.py b/tempest/api/compute/volumes/test_volumes_get.py
index d9ee5b1..01cfb5f 100644
--- a/tempest/api/compute/volumes/test_volumes_get.py
+++ b/tempest/api/compute/volumes/test_volumes_get.py
@@ -16,7 +16,6 @@
 from testtools import matchers
 
 from tempest.api.compute import base
-from tempest.common import waiters
 from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
@@ -42,7 +41,7 @@
     @classmethod
     def setup_clients(cls):
         super(VolumesGetTestJSON, cls).setup_clients()
-        cls.client = cls.volumes_extensions_client
+        cls.volumes_client = cls.volumes_extensions_client
 
     @decorators.idempotent_id('f10f25eb-9775-4d9d-9cbe-1cf54dae9d5f')
     def test_volume_create_get_delete(self):
@@ -50,22 +49,19 @@
         v_name = data_utils.rand_name(self.__class__.__name__ + '-Volume')
         metadata = {'Type': 'work'}
         # Create volume
-        volume = self.client.create_volume(size=CONF.volume.volume_size,
-                                           display_name=v_name,
-                                           metadata=metadata)['volume']
+        volume = self.create_volume(size=CONF.volume.volume_size,
+                                    display_name=v_name,
+                                    metadata=metadata)
         self.assertIn('id', volume)
-        self.addCleanup(self.delete_volume, volume['id'])
         self.assertIn('displayName', volume)
         self.assertEqual(volume['displayName'], v_name,
                          "The created volume name is not equal "
                          "to the requested name")
         self.assertIsNotNone(volume['id'],
                              "Field volume id is empty or not found.")
-        # Wait for Volume status to become ACTIVE
-        waiters.wait_for_volume_resource_status(self.client, volume['id'],
-                                                'available')
         # GET Volume
-        fetched_volume = self.client.show_volume(volume['id'])['volume']
+        fetched_volume = self.volumes_client.show_volume(
+            volume['id'])['volume']
         # Verification of details of fetched Volume
         self.assertEqual(v_name,
                          fetched_volume['displayName'],