Remove skip statement for bug 1450859 is fixed

bug 1450859(list servers always returns all with 'ip6' filter) is
fixed on 2016-03-10, so the skip statement should be removed.

Change-Id: Ic10c3374284c71856ee8fa5ea85f9d9b6121c549
diff --git a/tempest/api/compute/servers/test_list_server_filters.py b/tempest/api/compute/servers/test_list_server_filters.py
index c1fbb12..3d61476 100644
--- a/tempest/api/compute/servers/test_list_server_filters.py
+++ b/tempest/api/compute/servers/test_list_server_filters.py
@@ -274,14 +274,9 @@
             msg = 'fixed_network_name needs to be configured to run this test'
             raise self.skipException(msg)
         self.s1 = self.client.show_server(self.s1['id'])['server']
-        for addr_spec in self.s1['addresses'][self.fixed_network_name]:
-            ip = addr_spec['addr']
-            if addr_spec['version'] == 4:
-                params = {'ip': ip}
-                break
-        else:
-            msg = "Skipped until bug 1450859 is resolved"
-            raise self.skipException(msg)
+        # Get first ip address inspite of v4 or v6
+        addr_spec = self.s1['addresses'][self.fixed_network_name][0]
+        params = {'ip': addr_spec['addr']}
         body = self.client.list_servers(**params)
         servers = body['servers']