qmp: add block_job_set_speed command

Add block_job_set_speed, which sets the maximum speed for a background
block operation.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/hmp.c b/hmp.c
index cde8d7a..bf3d9df 100644
--- a/hmp.c
+++ b/hmp.c
@@ -794,3 +794,14 @@
 
     hmp_handle_error(mon, &error);
 }
+
+void hmp_block_job_set_speed(Monitor *mon, const QDict *qdict)
+{
+    Error *error = NULL;
+    const char *device = qdict_get_str(qdict, "device");
+    int64_t value = qdict_get_int(qdict, "value");
+
+    qmp_block_job_set_speed(device, value, &error);
+
+    hmp_handle_error(mon, &error);
+}