Second attempt at preventing ipv6 route enumeration on EL4 machines

system/setup

@@ -1370,6 +1370,9 @@ class LinuxNetwork(Network):
         )
         interface = dict(v4 = {}, v6 = {})
         for v in 'v4', 'v6':
+            if v == 'v6' and self.facts['os_family'] == 'RedHat' \
+                and self.facts['distribution_version'].startswith('4.'):
+                continue
             if v == 'v6' and not socket.has_ipv6:
                 continue
             rc, out, err = module.run_command(command[v])