GRE: fix VRF unit-tests

Change-Id: Ic6d011065bf062a84fdccdb1726ed3e5ed99cfbc
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/test/test_gre.py b/test/test_gre.py
index df3d2b4..cd89806 100644
--- a/test/test_gre.py
+++ b/test/test_gre.py
@@ -768,17 +768,20 @@
         self.verify_decapped_4o4(self.pg0, rx, tx)
 
         #
-        # Send tunneled packets that match the created tunnel and
+        # Send tunneled packets that match the created tunnel
         # but arrive on an interface that is not in the tunnel's
-        # encap VRF, these are dropped
+        # encap VRF, these are dropped.
+        # IP enable the interface so they aren't dropped due to
+        # IP not being enabled.
         #
+        self.pg2.config_ip4()
         self.vapi.cli("clear trace")
         tx = self.create_tunnel_stream_4o4(self.pg2,
                                            "2.2.2.2",
                                            self.pg1.local_ip4,
                                            self.pg0.local_ip4,
                                            self.pg0.remote_ip4)
-        self.pg1.add_stream(tx)
+        self.pg2.add_stream(tx)
 
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()
@@ -786,6 +789,8 @@
         self.pg0.assert_nothing_captured(
             remark="GRE decap packets in wrong VRF")
 
+        self.pg2.unconfig_ip4()
+
         #
         # test case cleanup
         #