Use valid CIDR block in network test

test/test_network_service.py

@@ -86,7 +86,7 @@ class CloudNetworkServiceTestCase(ProviderTestBase):
 
         def create_subnet(name):
             return self.provider.networking.subnets.create(
-                network=net, cidr_block="10.0.0.1/24", name=name,
+                network=net, cidr_block="10.0.0.0/24", name=name,
                 zone=helpers.get_provider_test_data(
                     self.provider, 'placement'))