Fix bad classname

During change Ie8e0d17a95e8378733dd21ab341dfad1331edf6e it seems, that
one class was left behind. This patch will fix this issue.

Fixes bug 1243421

Change-Id: I3d2d739484814acc843ea8c4ca527845cbc0c5be
diff --git a/tempest/api/compute/admin/test_hypervisor_negative.py b/tempest/api/compute/admin/test_hypervisor_negative.py
index 69b8d9c..c6455b5 100644
--- a/tempest/api/compute/admin/test_hypervisor_negative.py
+++ b/tempest/api/compute/admin/test_hypervisor_negative.py
@@ -23,7 +23,7 @@
 from tempest.test import attr
 
 
-class HypervisorAdminNegativeTestJSON(base.BaseComputeAdminTest):
+class HypervisorAdminNegativeTestJSON(base.BaseV2ComputeAdminTest):
 
     """
     Tests Hypervisors API that require admin privileges