tools: init.d/Linux/xencommons: load evtchn and gntdev modules

There is currently no code in the kernel to trigger autoload of the
evtchn or gntdev drivers. Load them manually during xencommons start.
Handle both pvops and xenlinux module names.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

xen-unstable changeset: 24334:9c8aff308002
Backport-requested-by: Olaf Hering <olaf@aepfle.de>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

     1.1 --- a/tools/hotplug/Linux/init.d/xencommons	Thu Dec 08 16:50:16 2011 +0000
     1.2 +++ b/tools/hotplug/Linux/init.d/xencommons	Thu Dec 08 16:50:28 2011 +0000
     1.3 @@ -54,6 +54,11 @@ do_start () {
     1.4          local time=0
     1.5  	local timeout=30
     1.6  
     1.7 +	modprobe xen-evtchn 2>/dev/null
     1.8 +	modprobe xen-gntdev 2>/dev/null
     1.9 +	modprobe evtchn 2>/dev/null
    1.10 +	modprobe gntdev 2>/dev/null
    1.11 +
    1.12  	if ! `xenstore-read -s / >/dev/null 2>&1`
    1.13  	then
    1.14  		test -z "$XENSTORED_ROOTDIR" || XENSTORED_ROOTDIR="/var/lib/xenstored"