[CVP] Exclude dns nodes in test_single_vip_exists

Change-Id: Ieb6418c7306a52b0937b0db2c06b0d9979d8c672
Related-PROD: PROD-30734
(cherry picked from commit 2a11a6c2f1ef79c57764b7b65e22f664c3868635)
diff --git a/test_set/cvp-sanity/tests/test_single_vip.py b/test_set/cvp-sanity/tests/test_single_vip.py
index 91fcd92..cee92ec 100644
--- a/test_set/cvp-sanity/tests/test_single_vip.py
+++ b/test_set/cvp-sanity/tests/test_single_vip.py
@@ -19,7 +19,7 @@
                         else ""
     no_vip = {}
     for group in groups:
-        if group in ['cmp', 'cfg', 'kvm', 'cmn', 'osd', 'gtw']:
+        if group in ['cmp', 'cfg', 'kvm', 'cmn', 'osd', 'gtw', 'dns']:
             continue
         nodes_list = local_salt_client.cmd(
             tgt="L@" + ','.join(groups[group]),