Move test_volume_manage to unversioned path

Just before I2acfe5a28a2533b16565e6ebad5c820e7c3a3967 , the patch
which adds test_volume_manage was merged. So this patch moves the
test into unversioned path again.

Change-Id: I46f14c5dc944110d383ca3f1a395e681d6fb3159
diff --git a/tempest/api/volume/admin/v2/test_volume_manage.py b/tempest/api/volume/admin/test_volume_manage.py
similarity index 96%
rename from tempest/api/volume/admin/v2/test_volume_manage.py
rename to tempest/api/volume/admin/test_volume_manage.py
index f983490..a039085 100644
--- a/tempest/api/volume/admin/v2/test_volume_manage.py
+++ b/tempest/api/volume/admin/test_volume_manage.py
@@ -22,11 +22,11 @@
 CONF = config.CONF
 
 
-class VolumeManageAdminV2Test(base.BaseVolumeAdminTest):
+class VolumeManageAdminTest(base.BaseVolumeAdminTest):
 
     @classmethod
     def skip_checks(cls):
-        super(VolumeManageAdminV2Test, cls).skip_checks()
+        super(VolumeManageAdminTest, cls).skip_checks()
 
         if not CONF.volume_feature_enabled.manage_volume:
             raise cls.skipException("Manage volume tests are disabled")