Refactor acloud.public.errors to acloud.errors.

Bug: 113753798
Test: atest acloud_test && run acloud create/list/delete
Change-Id: I03b4b34769d754bfebd279895b0ca44311bbecc7
diff --git a/public/acloud_kernel/kernel_swapper.py b/public/acloud_kernel/kernel_swapper.py
index 6041b82..1e6abe3 100755
--- a/public/acloud_kernel/kernel_swapper.py
+++ b/public/acloud_kernel/kernel_swapper.py
@@ -19,7 +19,7 @@
 """
 import subprocess
 
-from acloud.public import errors
+from acloud import errors
 from acloud.public import report
 from acloud.internal.lib import android_compute_client
 from acloud.internal.lib import auth