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_l3xc.py b/test/test_l3xc.py
index 69267b3..d94292e 100644
--- a/test/test_l3xc.py
+++ b/test/test_l3xc.py
@@ -11,6 +11,7 @@
 from scapy.layers.inet import IP, UDP
 
 from vpp_object import VppObject
+from config import config
 
 NUM_PKTS = 67
 
@@ -56,6 +57,7 @@
         return "l3xc-%d" % self.intf.sw_if_index
 
 
+@unittest.skipIf("l3xc" in config.excluded_plugins, "Exclude L3XC plugin tests")
 class TestL3xc(VppTestCase):
     """L3XC Test Case"""