xenserver: Remove support for XenServer versions older than 5.6 FP1.

Commit 404c169247 breaks compatibility with
XenServers older than 5.6 FP1.  This commit removes the last vestiges of
support for those older XenServer versions.

Signed-off-by: Justin Pettit <jpettit@nicira.com>

xenserver/opt_xensource_libexec_InterfaceReconfigureVswitch.py

@@ -1,5 +1,5 @@
 # Copyright (c) 2008,2009 Citrix Systems, Inc.
-# Copyright (c) 2009,2010 Nicira Networks.
+# Copyright (c) 2009,2010,2011 Nicira Networks.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published
@@ -465,10 +465,6 @@ class DatapathVswitch(Datapath):
         dpname = pif_bridge_name(self._dp)
         
         if pif_is_vlan(self._pif):
-            # XXX this is only needed on XS5.5, because XAPI misguidedly
-            # creates the fake bridge (via bridge ioctl) before it calls us.
-            vsctl_argv += ['--', '--if-exists', 'del-br', bridge]
-
             # configure_datapath() set up the underlying datapath bridge.
             # Stack a VLAN bridge on top of it.
             vsctl_argv += ['--', '--may-exist', 'add-br',
@@ -550,11 +546,6 @@ class DatapathVswitch(Datapath):
         
         bridge = pif_bridge_name(dp)
 
-        #nw = db().get_pif_record(self._pif)['network']
-        #nwrec = db().get_network_record(nw)
-        #vsctl_argv += ['# deconfigure network-uuids']
-        #vsctl_argv += ['--del-entry=bridge.%s.network-uuids=%s' % (bridge,nwrec['uuid'])]
-
         log("deconfigure ipdev %s on %s" % (ipdev,bridge))
         vsctl_argv += ["# deconfigure ipdev %s" % ipdev]
         vsctl_argv += datapath_deconfigure_ipdev(ipdev)