Update test_k8s_cncf_certification

Use sonobuoy directly because
sonobuoy-conformance.yamly was removed from cncf repo.
And remove unnecessary greps from cncf code.

Change-Id: If47fe7096b06d02c8c3812506f51af81f4e9f08a
Closes-PROD: PROD-22455
diff --git a/tcp_tests/tests/system/test_k8s_actions.py b/tcp_tests/tests/system/test_k8s_actions.py
index ea12129..6510a67 100644
--- a/tcp_tests/tests/system/test_k8s_actions.py
+++ b/tcp_tests/tests/system/test_k8s_actions.py
@@ -75,7 +75,7 @@
                                       'cncf_results.tar.gz'])
     @pytest.mark.fail_snapshot
     def test_k8s_cncf_certification(self, show_step, config, k8s_deployed,
-                                    cncf_log_helper):
+                                    k8s_cncf_log_helper):
         """Run cncf e2e suite and provide files needed for pull request
         to the CNCF repo