Revert to python logging fr log_util.py (#1599)

* logging enhancements for import automation

* fix syntax

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* fix library call

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* Update tools/statvar_importer/stat_var_processor.py

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* Update import-automation/executor/app/executor/import_executor.py

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* Update util/timer.py

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* add timer_test

* review comments

* lint

* fix tests

* revert to python logging for log_util.py

---------

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Author: ajaits

util/log_util.py

@@ -14,11 +14,11 @@
 """Utility functions for logging."""
 
 import json
+import logging
 import os
 import sys
 
 from absl import flags
-from absl import logging
 
 from google.cloud.logging.handlers import StructuredLogHandler
 from functools import wraps