[CVP] Refactor salt client class

Change-Id: I91cfffe1c8d5df0224657ce9e36be9063b56f0b3
Related-PROD: PROD-28981
Related-PROD: PROD-28729
Related-PROD: PROD-28624
Related-PROD: PROD-29286
diff --git a/test_set/cvp-sanity/tests/test_default_gateway.py b/test_set/cvp-sanity/tests/test_default_gateway.py
index 36ca70e..8cea880 100644
--- a/test_set/cvp-sanity/tests/test_default_gateway.py
+++ b/test_set/cvp-sanity/tests/test_default_gateway.py
@@ -1,21 +1,22 @@
 import json
-import pytest
-import os
-import utils
 
 
 def test_check_default_gateways(local_salt_client, nodes_in_group):
     netstat_info = local_salt_client.cmd(
-        "L@"+','.join(nodes_in_group), 'cmd.run', ['ip r | sed -n 1p'], expr_form='compound')
+        tgt="L@"+','.join(nodes_in_group),
+        param='ip r | sed -n 1p',
+        expr_form='compound')
 
     gateways = {}
-    nodes = netstat_info.keys()
 
-    for node in nodes:
-        if netstat_info[node] not in gateways:
-            gateways[netstat_info[node]] = [node]
+    for node in netstat_info.keys():
+        gateway = netstat_info[node]
+        if isinstance(gateway, bool):
+            gateway = 'Cannot access node(-s)'
+        if gateway not in gateways:
+            gateways[gateway] = [node]
         else:
-            gateways[netstat_info[node]].append(node)
+            gateways[gateway].append(node)
 
     assert len(gateways.keys()) == 1, \
         "There were found few gateways: {gw}".format(