xenserver: interface-reconfigure and vif hotplug relicensing.

xenserver: interface-reconfigure and vif hotplug relicensing.

As part of the Open Sourcing of xapi (the XenServer toolstack) via the
XenCloud project (announcement in [0]). The upstream versions of
interface-reconfigure and the vif hotplug script have been re-licensed
under an LGPL v2.1 + exception license. The exception applies to other
files in the upstream repository and doesn't particularly make sense for
these scripts but it is included to maintain the uniformity of the
license for the upstream repository.

This patch synchronises the licenses headers on those scripts with the
upstream version. Since those headers refer to a file called LICENSE in
the upstream repository I have included a copy here, slightly modified
to indicate precisely which files it applies to.

Git shows[1] that only myself and Nicira employees have made
modifications to these scripts in the openvswitch repository. The
licensing change has been okayed by Keith Amidon on behalf of Nicira.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
[0]
http://lists.xensource.com/archives/html/xen-devel/2009-11/msg00117.html