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_span.py b/test/test_span.py
index 8eea1b0..31dff68 100644
--- a/test/test_span.py
+++ b/test/test_span.py
@@ -14,6 +14,7 @@
 from vpp_vxlan_tunnel import VppVxlanTunnel
 from collections import namedtuple
 from vpp_papi import VppEnum
+from config import config
 
 
 Tag = namedtuple("Tag", ["dot1", "vlan"])
@@ -21,6 +22,9 @@
 DOT1Q = 0x8100
 
 
+@unittest.skipIf(
+    "vxlan" in config.excluded_plugins, "Exclude tests requiring VXLAN plugin"
+)
 class TestSpan(VppTestCase):
     """SPAN Test Case"""