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/fixtures/k8s_fixtures.py b/tcp_tests/fixtures/k8s_fixtures.py
index a85473d..a93065c 100644
--- a/tcp_tests/fixtures/k8s_fixtures.py
+++ b/tcp_tests/fixtures/k8s_fixtures.py
@@ -150,7 +150,7 @@
 
 
 @pytest.fixture(scope='function')
-def cncf_log_helper(request, func_name, underlay, k8s_deployed):
+def k8s_cncf_log_helper(request, func_name, underlay, k8s_deployed):
     """Finalizer to prepare cncf tar.gz and save results from archive"""
 
     cncf_publisher = request.keywords.get('cncf_publisher', None)
@@ -163,7 +163,7 @@
                     or "{}".format(func_name)
             k8s_deployed.extract_file_to_node(
                 system='k8s', file_path='tmp/sonobuoy',
-                pod_name='sonobuoy', pod_namespace='sonobuoy'
+                pod_name='sonobuoy', pod_namespace='heptio-sonobuoy'
             )
             k8s_deployed.manage_cncf_archive()
             k8s_deployed.download_k8s_logs(files)