system/xen: Updated for version 4.5.0 and more.

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+vif-openvswitch-extended: This script extends vif-openvswitch features.
+
+The original vif-openvswitch script, which can also be found in this package,
+was used as a template for this "extended" script. The main purpose here is to
+add HTB rate limiting and IP/ARP address spoof prevention between domU guests.
+
+Until openvswitch.conf is present and configured in XEN_CONFIG_DIR path, this
+script will behave just like the original one. This package uses /etc/xen config
+path by default.
+
+To enable this script for all guests by default, set xl.conf variable like this:
+
+  vif.default.script="vif-openvswitch-extended"
+
+Additionally, included is an openvswitch-clean.sh helper script; it can be used
+to clean up and (re)apply configuration options found in openvswitch.conf file.
+Due to the fact that this script is based on the original script, which you
+might already be using, it is easy to switch over. You can start by configuring
+openvswitch.conf, xl.conf and finally run helper script to set everything up.
+
+These scripts were written for my own use, and its possible they have some bugs
+or unforeseen deficiencies on your system. In either case, feel free to write
+me an email about it.