Don't use duplicate IP addresses

Neutron is going to start rejecting attempts to create multiple members
in the same pool with duplicate IP address/port tuples.  This change
updates the tempest gate to make it stop trying to create new members
with the same IP address.

Change-Id: If8f88f2897728d6be63438847a1fa2320e56b1ae
Closes-Bug: #1252834
diff --git a/tempest/api/network/test_load_balancer.py b/tempest/api/network/test_load_balancer.py
index e3bf4e8..868a734 100644
--- a/tempest/api/network/test_load_balancer.py
+++ b/tempest/api/network/test_load_balancer.py
@@ -134,7 +134,7 @@
     @attr(type='smoke')
     def test_create_update_delete_member(self):
         # Creates a member
-        resp, body = self.client.create_member("10.0.9.46", 80,
+        resp, body = self.client.create_member("10.0.9.47", 80,
                                                self.pool['id'])
         self.assertEqual('201', resp['status'])
         member = body['member']