scripts: Excise `cros_logging` module

Remove all usages of `cros_logging` in chromite/scripts and replace them
with the stdlib `logging` module. The NOTICE level is already provided by
the custom Logger subclass initialized in chromite's top level module __init__.py

This change was made by finding all imports of `cros_logging` and
replacing those usages with stdlib `logging` and then running `isort`
over all modified files.

Additionally wrapper3_unittest was modified to copy chromite's __init__.py
verbatim rather than creating an empty init, because code now depends on
the logger definition coming from that file.

BUG=b:191490453
TEST=`run_tests`

Change-Id: I81879290689e51e9836b9c47ffdd88a5a7a0b4e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3042188
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Chris McDonald <cjmcdonald@chromium.org>
diff --git a/scripts/build_api.py b/scripts/build_api.py
index f7efa83..dba8362 100644
--- a/scripts/build_api.py
+++ b/scripts/build_api.py
@@ -4,6 +4,7 @@
 
 """The Build API entry point."""
 
+import logging
 import os
 
 from chromite.api import api_config as api_config_lib
@@ -13,7 +14,6 @@
 from chromite.api.gen.chromite.api import build_api_config_pb2
 from chromite.lib import commandline
 from chromite.lib import cros_build_lib
-from chromite.lib import cros_logging as logging
 from chromite.utils import matching