tools/hotplug: fix bug on xendomains using xl

Make rdname function work with xl.

The rdname function not support json output of xl commands and this cause
problems using xl, for example the check if domUs are already running (because
they have been restored) on domUs autostart does not succeed and the domain is
created in any case, causing xl create to fail.

Signed-off-by: Fabio Fantoni <fabio.fantoni@m2r.biz>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/hotplug/Linux/init.d/xendomains

@@ -186,7 +186,7 @@ contains_something()
 rdname()
 {
     NM=$($CMD create --quiet --dryrun --defconfig "$1" |
-         sed -n 's/^.*(name \(.*\))$/\1/p')
+         sed -n 's/^.*(name \(.*\))$/\1/p;s/^.*"name": "\(.*\)",$/\1/p')
 }
 
 rdnames()