npt66: make plugin default disabled

Plugin is still in experimental state. No reason why it needs
to be default enabled.

Type: fix
Change-Id: Ibf1810215d4c8079a068bfc60aa7dd49306ee4e4
Signed-off-by: Ole Troan <otroan@employees.org>

test/test_npt66.py

@@ -12,6 +12,10 @@ from scapy.packet import Raw
 class TestNPT66(VppTestCase):
     """NPTv6 Test Case"""
 
+    extra_vpp_plugin_config = [
+        "plugin npt66_plugin.so {enable}",
+    ]
+
     def setUp(self):
         super(TestNPT66, self).setUp()