Mark k8s system tests with k8s_system mark

Change-Id: I0a1cb7e30648bdf9fd4f89c62fe08661b28c0117
Related-PROD: PROD-28588
diff --git a/tcp_tests/tests/system/test_calico.py b/tcp_tests/tests/system/test_calico.py
index 6399eb3..50d0005 100644
--- a/tcp_tests/tests/system/test_calico.py
+++ b/tcp_tests/tests/system/test_calico.py
@@ -29,6 +29,7 @@
     """
 
     @pytest.mark.fail_snapshot
+    @pytest.mark.k8s_system
     def test_k8s_netchecker_calico(self, show_step, config, k8s_deployed):
         """Test for deploying k8s environment with Calico plugin and check
            network connectivity between different pods by k8s-netchecker
@@ -50,6 +51,7 @@
     @pytest.mark.calico_ci
     @pytest.mark.cz8116
     @pytest.mark.k8s_calico
+    @pytest.mark.k8s_system
     def test_calico_route_recovery(self, show_step, config, underlay,
                                    k8s_deployed):
         """Test for deploying k8s environment with Calico plugin and check
@@ -146,6 +148,7 @@
 
     @pytest.mark.fail_snapshot
     @pytest.mark.calico_ci
+    @pytest.mark.k8s_system
     def test_calico_network_policies(self, show_step, config, underlay,
                                      k8s_deployed):
         """Test for deploying k8s environment with Calico and check