tests: skip more excluded plugin tests

Check and skip VPP_EXCLUDED_PLUGINS tests for most of plugins.

Type: improvement
Signed-off-by: Dmitry Valter <d-valter@yandex-team.com>
Change-Id: I23fd3666729251c639aa8da72a676058e3f5bb4e
diff --git a/test/test_dslite.py b/test/test_dslite.py
index ca481bc..b88605b 100644
--- a/test/test_dslite.py
+++ b/test/test_dslite.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 import socket
+import unittest
 
 from asfframework import tag_fixme_vpp_workers
 from framework import VppTestCase
@@ -17,9 +18,11 @@
 from syslog_rfc5424_parser import SyslogMessage, ParseError
 from syslog_rfc5424_parser.constants import SyslogSeverity
 from vpp_ip_route import VppIpRoute, VppRoutePath
+from config import config
 
 
 @tag_fixme_vpp_workers
+@unittest.skipIf("nat" in config.excluded_plugins, "Exclude NAT plugin tests")
 class TestDSlite(VppTestCase):
     """DS-Lite Test Cases"""
 
@@ -233,6 +236,7 @@
         self.logger.info(self.vapi.cli("show dslite sessions"))
 
 
+@unittest.skipIf("nat" in config.excluded_plugins, "Exclude NAT plugin tests")
 class TestDSliteCE(VppTestCase):
     """DS-Lite CE Test Cases"""