cpu_hotplug: autotest module is no longer supported, remove it.

autotest module is no longer supported, remove it from test.
Signed-off-by: NJie Tang <tangjie18@huawei.com>

qemu/tests/cpu_hotplug.py

@@ -153,8 +153,6 @@ def run(test, params, env):
 
     timeout = int(params.get("cpu_hotplug_timeout", 300))
     error_context.context("running cpu_hotplug autotest after cpu addition")
-    utils_test.run_autotest(vm, session, control_path, timeout,
-                            test.outputdir, params)
 
     # Last, but not least, let's offline/online the CPUs in the guest
     # several times