Switch migrate_set_speed() to take an 'o' argument rather than a float.

Clarify default value of MB in migration speed argument in monitor, if
no suffix is specified. This differ from previous default of bytes,
but is consistent with the rest of the places where we accept a size
argument.

Signed-off-by: Jes Sorensen <[email protected]>
Signed-off-by: Anthony Liguori <[email protected]>
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 81999aa..e5585ba 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -754,9 +754,10 @@
 
     {
         .name       = "migrate_set_speed",
-        .args_type  = "value:f",
+        .args_type  = "value:o",
         .params     = "value",
-        .help       = "set maximum speed (in bytes) for migrations",
+        .help       = "set maximum speed (in bytes) for migrations. "
+	"Defaults to MB if no size suffix is specified, ie. B/K/M/G/T",
         .user_print = monitor_user_noop,
         .mhandler.cmd_new = do_migrate_set_speed,
     },