memory/hmp: Print owners/parents in "info mtree"

This adds owners/parents (which are the same, just occasionally
owner==NULL) printing for memory regions; a new '-o' flag
enabled new output.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <20180604032511.6980-1-aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/monitor.c b/monitor.c
index 0730a27..0988eb4 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2007,8 +2007,10 @@
 {
     bool flatview = qdict_get_try_bool(qdict, "flatview", false);
     bool dispatch_tree = qdict_get_try_bool(qdict, "dispatch_tree", false);
+    bool owner = qdict_get_try_bool(qdict, "owner", false);
 
-    mtree_info((fprintf_function)monitor_printf, mon, flatview, dispatch_tree);
+    mtree_info((fprintf_function)monitor_printf, mon, flatview, dispatch_tree,
+               owner);
 }
 
 static void hmp_info_numa(Monitor *mon, const QDict *qdict)