Remove unnecessary wait_for_volume_resource_status

In test_volume_crud_with_volume_type_and_extra_specs,
wait_for_volume_resource_status is already included in
self.create_volume, so there is no need to call it after
self.create_volume. This is to remove it for code clean.

Change-Id: I1057c7776ff5938f5fc72400c12410d57b732320
diff --git a/tempest/api/volume/admin/test_volume_types.py b/tempest/api/volume/admin/test_volume_types.py
index ac717f8..af1024c 100644
--- a/tempest/api/volume/admin/test_volume_types.py
+++ b/tempest/api/volume/admin/test_volume_types.py
@@ -57,8 +57,6 @@
                          "to the requested name")
         self.assertIsNotNone(volume['id'],
                              "Field volume id is empty or not found.")
-        waiters.wait_for_volume_resource_status(self.volumes_client,
-                                                volume['id'], 'available')
 
         # Update volume with new volume_type
         self.volumes_client.retype_volume(volume['id'],