Refactor acloud.public.errors to acloud.errors.

Bug: 113753798
Test: atest acloud_test && run acloud create/list/delete
Change-Id: I03b4b34769d754bfebd279895b0ca44311bbecc7
diff --git a/setup/google_sdk.py b/setup/google_sdk.py
index 2ff009b..c012dfe 100644
--- a/setup/google_sdk.py
+++ b/setup/google_sdk.py
@@ -36,8 +36,8 @@
 import tempfile
 import urllib2
 
+from acloud import errors
 from acloud.internal.lib import utils
-from acloud.public import errors
 
 SDK_BIN_PATH = os.path.join("google-cloud-sdk", "bin")
 GCLOUD_BIN = "gcloud"