[python3 migration] remove py-mock: import mock from unittest
use from unittest import mock instead of import mock
and remove py-mock libs from Android.bp
BUG: 137195528
Test: atest acloud_test --host
Change-Id: I349e7b5c184f2271402b73804d025db981f18dd5
diff --git a/setup/host_setup_runner_test.py b/setup/host_setup_runner_test.py
index 111540e..b98772d 100644
--- a/setup/host_setup_runner_test.py
+++ b/setup/host_setup_runner_test.py
@@ -16,7 +16,8 @@
import shutil
import tempfile
import unittest
-import mock
+
+from unittest import mock
from acloud.internal.lib import driver_test_lib
from acloud.internal.lib import utils