Revert "Revert "make test: fix broken interfaces""

This reverts commit c8efa29b6f9a91381897b54f1147daf922ed7164.

Change-Id: I1d5c5773d5f86a63073e255336bd9de628e26179
Signed-off-by: Klement Sekera <ksekera@cisco.com>
diff --git a/test/vpp_gre_interface.py b/test/vpp_gre_interface.py
index 3de3e5c..d5a40ee 100644
--- a/test/vpp_gre_interface.py
+++ b/test/vpp_gre_interface.py
@@ -11,7 +11,7 @@
     def __init__(self, test, src_ip, dst_ip, outer_fib_id=0, type=0,
                  session=0):
         """ Create VPP GRE interface """
-        self._test = test
+        super(VppGreInterface, self).__init__(test)
         self.t_src = src_ip
         self.t_dst = dst_ip
         self.t_outer_fib = outer_fib_id
@@ -25,10 +25,9 @@
                                               outer_fib_id=self.t_outer_fib,
                                               tunnel_type=self.t_type,
                                               session_id=self.t_session)
-        self._sw_if_index = r.sw_if_index
+        self.set_sw_if_index(r.sw_if_index)
         self.generate_remote_hosts()
         self.test.registry.register(self, self.test.logger)
-        super(VppGreInterface, self).__init__(self.test)
 
     def remove_vpp_config(self):
         s = socket.inet_pton(socket.AF_INET, self.t_src)
@@ -55,7 +54,7 @@
     def __init__(self, test, src_ip, dst_ip, outer_fib_id=0, type=0,
                  session=0):
         """ Create VPP GRE interface """
-        self._test = test
+        super(VppGre6Interface, self).__init__(test)
         self.t_src = src_ip
         self.t_dst = dst_ip
         self.t_outer_fib = outer_fib_id
@@ -70,10 +69,9 @@
                                               tunnel_type=self.t_type,
                                               session_id=self.t_session,
                                               is_ip6=1)
-        self._sw_if_index = r.sw_if_index
+        self.set_sw_if_index(r.sw_if_index)
         self.generate_remote_hosts()
         self.test.registry.register(self, self.test.logger)
-        super(VppGre6Interface, self).__init__(self.test)
 
     def remove_vpp_config(self):
         s = socket.inet_pton(socket.AF_INET6, self.t_src)