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

test/test_l2tp.py

@@ -5,9 +5,13 @@ from scapy.layers.inet6 import IPv6
 
 from asfframework import tag_fixme_vpp_workers
 from framework import VppTestCase
+from config import config
+
+import unittest
 
 
 @tag_fixme_vpp_workers
+@unittest.skipIf("l2tp" in config.excluded_plugins, "Exclude L2TP plugin tests")
 class TestL2tp(VppTestCase):
     """L2TP Test Case"""