[CVP] Add tags and review SL tests

Change-Id: Ic110e7123f42161911fc49daaaf3a3c045886eae
Related-PROD: PROD-17820
Related-PROD: PROD-20855
diff --git a/test_set/cvp-sanity/tests/test_mtu.py b/test_set/cvp-sanity/tests/test_mtu.py
index 0a3d2d0..b215c1d 100644
--- a/test_set/cvp-sanity/tests/test_mtu.py
+++ b/test_set/cvp-sanity/tests/test_mtu.py
@@ -4,6 +4,7 @@
 import os
 
 
+@pytest.mark.full
 def test_mtu(local_salt_client, nodes_in_group):
     testname = os.path.basename(__file__).split('.')[0]
     config = utils.get_configuration()