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_nat66.py b/test/test_nat66.py
index 44df722..54f9321 100644
--- a/test/test_nat66.py
+++ b/test/test_nat66.py
@@ -13,8 +13,10 @@
 from scapy.layers.l2 import Ether, GRE
 from util import ppp
 from vpp_papi import VppEnum
+from config import config
 
 
+@unittest.skipIf("nat" in config.excluded_plugins, "Exclude NAT plugin tests")
 class TestNAT66(VppTestCase):
     """NAT66 Test Cases"""