New cpu-max field in query-machines QMP command output

Alter the query-machines QMP command to output information about
maximum number of CPUs for each machine type with default value
set to 1 in case the number of max_cpus is not set.

Signed-off-by: Michal Novotny <minovotn@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/vl.c b/vl.c
index d694a90..6547b5f 100644
--- a/vl.c
+++ b/vl.c
@@ -1617,6 +1617,7 @@
         }
 
         info->name = g_strdup(m->name);
+        info->cpu_max = !m->max_cpus ? 1 : m->max_cpus;
 
         entry = g_malloc0(sizeof(*entry));
         entry->value = info;