Refactor acloud.public.errors to acloud.errors.

Bug: 113753798
Test: atest acloud_test && run acloud create/list/delete
Change-Id: I03b4b34769d754bfebd279895b0ca44311bbecc7
diff --git a/internal/lib/goldfish_compute_client.py b/internal/lib/goldfish_compute_client.py
index 9697d8e..4377d6d 100644
--- a/internal/lib/goldfish_compute_client.py
+++ b/internal/lib/goldfish_compute_client.py
@@ -42,9 +42,9 @@
 import getpass
 import logging
 
+from acloud import errors
 from acloud.internal.lib import android_compute_client
 from acloud.internal.lib import gcompute_client
-from acloud.public import errors
 
 logger = logging.getLogger(__name__)