Remove JSON from class name

NetworksTestJSON class has already been renamed to NetworksTest
in patch Ie4ffd458456d03b0b817b01bbed391f359240db2. To be
consistent, remove JSON from other test classes that inheritate
from it.

Change-Id: I5504aea2263842a639df51839cc590e467fc10e8
diff --git a/tempest/api/network/test_networks.py b/tempest/api/network/test_networks.py
index b6f9da7..a5fb25c 100644
--- a/tempest/api/network/test_networks.py
+++ b/tempest/api/network/test_networks.py
@@ -397,7 +397,7 @@
         self.assertEmpty(body['subnets'], "Public subnets visible")
 
 
-class BulkNetworkOpsTestJSON(base.BaseNetworkTest):
+class BulkNetworkOpsTest(base.BaseNetworkTest):
     """Tests the following operations in the Neutron API:
 
         bulk network creation
@@ -520,11 +520,11 @@
             self.assertIn(n['id'], ports_list)
 
 
-class BulkNetworkOpsIpV6TestJSON(BulkNetworkOpsTestJSON):
+class BulkNetworkOpsIpV6Test(BulkNetworkOpsTest):
     _ip_version = 6
 
 
-class NetworksIpV6TestJSON(NetworksTest):
+class NetworksIpV6Test(NetworksTest):
     _ip_version = 6
 
     @test.idempotent_id('e41a4888-65a6-418c-a095-f7c2ef4ad59a')
@@ -576,7 +576,7 @@
                               'Subnet are not in the same network')
 
 
-class NetworksIpV6TestAttrs(NetworksIpV6TestJSON):
+class NetworksIpV6TestAttrs(NetworksIpV6Test):
 
     @classmethod
     def skip_checks(cls):