Further cleanup of scale tests.
Re-use the vrouter and tls test case methods from scaleTest instead of code duplication.

Change-Id: Ibe53e786a9ac5cf567d6b1bc69d367f3bf707472
diff --git a/src/test/vrouter/vrouterTest.py b/src/test/vrouter/vrouterTest.py
index ee7328d..28a1ed3 100644
--- a/src/test/vrouter/vrouterTest.py
+++ b/src/test/vrouter/vrouterTest.py
@@ -665,3 +665,7 @@
         time.sleep(60)
         self.vrouter_traffic_verify(positive_test = True)
         assert_equal(res, True)
+
+    def vrouter_scale(self, num_routes, peers = 1):
+        '''Called from scale test'''
+        return self.__vrouter_network_verify(num_routes, peers = peers)