qemu: capabilities: Add gluster.debug_level detection for 2.8.0+

Qemu 2.8.0+ changes arguments structure for blockdev-add in the effort
to make it finally stable. Since libvirt recently added the detection of
gluster debug support relying on the old syntax we need to add the new
as well.

src/qemu/qemu_capabilities.c

@@ -1725,6 +1725,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsUSBNECXHCI[] = {
 /* see documentation for virQEMUCapsQMPSchemaGetByPath for the query format */
 static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] = {
     { "blockdev-add/arg-type/options/+gluster/debug-level", QEMU_CAPS_GLUSTER_DEBUG_LEVEL},
+    { "blockdev-add/arg-type/+gluster/debug", QEMU_CAPS_GLUSTER_DEBUG_LEVEL},
 };
 
 struct virQEMUCapsObjectTypeProps {

tests/qemucapabilitiesdata/caps_2.8.0.x86_64.xml

@@ -195,6 +195,7 @@
   <flag name='ivshmem-plain'/>
   <flag name='ivshmem-doorbell'/>
   <flag name='query-qmp-schema'/>
+  <flag name='gluster.debug_level'/>
   <flag name='vhost-scsi'/>
   <flag name='drive-iotune-group'/>
   <version>2007093</version>