acloud: fix py3 compatible issue: ModuleNotFoundError: No module named 'distutils.spawn'

BUG: 137195528
BUG: 144319579
Test: atest acloud_test --host
acloud-dev create
acloud-dev create --local-instance
acloud-dev delete
acloud-dev setup --force

Change-Id: Iced0aef43643c90dfa062a2ef341cf4ab264015c
diff --git a/setup/google_sdk.py b/setup/google_sdk.py
index 925b772..4867ca9 100644
--- a/setup/google_sdk.py
+++ b/setup/google_sdk.py
@@ -27,7 +27,6 @@
 google_sdk.CleanUp()
 """
 
-from distutils.spawn import find_executable
 import logging
 import os
 import platform
@@ -100,7 +99,7 @@
     Return:
         Boolean, return True if gcloud is installed, False otherwise.
     """
-    if find_executable(GCLOUD_BIN):
+    if utils.FindExecutable(GCLOUD_BIN):
         return True
     return False
 
@@ -146,7 +145,7 @@
         Raise:
             NoGoogleSDKDetected if we can't find the sdk path.
         """
-        builtin_gcloud = find_executable(GCLOUD_BIN)
+        builtin_gcloud = utils.FindExecutable(GCLOUD_BIN)
         if builtin_gcloud:
             return os.path.dirname(builtin_gcloud)
         elif os.path.exists(self._tmp_sdk_path):