Revert "add ipsecmb plugin"

This reverts commit be16020c5034bc69df25a8ecd7081aec9898d93c.

The arm verify job actually failed but the result was overwritten by an x86 ubuntu retry. 

Change-Id: Idcae7691fc575053563b8ff8bcad661c15891668
Signed-off-by: Florin Coras <fcoras@cisco.com>
diff --git a/test/test_ipsec_nat.py b/test/test_ipsec_nat.py
index 7e6e1d4..e9efa03 100644
--- a/test/test_ipsec_nat.py
+++ b/test/test_ipsec_nat.py
@@ -9,7 +9,7 @@
 from template_ipsec import TemplateIpsec
 
 
-class TemplateIPSecNAT(TemplateIpsec):
+class IPSecNATTestCase(TemplateIpsec):
     """ IPSec/NAT
     TUNNEL MODE:
 
@@ -33,7 +33,7 @@
 
     @classmethod
     def setUpClass(cls):
-        super(TemplateIPSecNAT, cls).setUpClass()
+        super(IPSecNATTestCase, cls).setUpClass()
         cls.tun_if = cls.pg0
         cls.vapi.ipsec_spd_add_del(cls.tun_spd_id)
         cls.vapi.ipsec_interface_add_del_spd(cls.tun_spd_id,
@@ -236,8 +236,3 @@
         self.pg_start()
         capture = self.pg1.get_capture(len(pkts))
         self.verify_capture_plain(capture)
-
-
-class IPSecNAT(TemplateIPSecNAT):
-    """ IPSec/NAT """
-    pass