tools: init scripts: xencommons: Provides `xen'

tools: init scripts: xencommons: Provides `xen'

It is useful to have a single `xen' facility (in the LSB Provides
namespace).  That allows other facilities to specify that they should
go after `xen' without needing to know the implementation details.

This service name is already Provide'd by the (fairly different) init
scripts used in Debian.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Release-acked-by: Juergen Gross <jgross@suse.com>