tools/hotplug: use xencommons as EnvironmentFile in xenconsoled.service

tools/hotplug: use xencommons as EnvironmentFile in xenconsoled.service

The referenced sysconfig/xenconsoled does not exist. If anything
needs to be specified it has to go into the existing
sysconfig/xencommons file.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>