pg: add support to delete pg interface

Type: improvement

Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Change-Id: I3102fded415c644673fb79a0fdb7a7448ce20f26
diff --git a/test/test_pg.py b/test/test_pg.py
index da3b225..14e149b 100644
--- a/test/test_pg.py
+++ b/test/test_pg.py
@@ -38,6 +38,7 @@
         for i in self.pg_interfaces:
             i.unconfig_ip4()
             i.admin_down()
+            i.remove_vpp_config()
         super(TestPgTun, self).tearDown()
 
     def test_pg_tun(self):