CertificateValidationTest needs network and subnet

Related-PROD: https://mirantis.jira.com/browse/PRODX-25589
Change-Id: I865bc2baf68aa6ac44d23bb60342205667b57345
(cherry picked from commit 36925ee13621a3423b29bd357711dc4d89f7deaa)
diff --git a/barbican_tempest_plugin/tests/scenario/test_certificate_validation.py b/barbican_tempest_plugin/tests/scenario/test_certificate_validation.py
index 2f22329..764e777 100644
--- a/barbican_tempest_plugin/tests/scenario/test_certificate_validation.py
+++ b/barbican_tempest_plugin/tests/scenario/test_certificate_validation.py
@@ -32,6 +32,11 @@
     max_microversion = 'latest'
 
     @classmethod
+    def setup_credentials(cls):
+        cls.set_network_resources(network=True, subnet=True)
+        super().setup_credentials()
+
+    @classmethod
     def resource_setup(cls):
         super(CertificateValidationTest, cls).resource_setup()
         cls.request_microversion = (