Use oslo.log instead of original logging

We are using oslo.log now, but some of the modules still use logging.
We should use oslo.log to keep consistency, besides, oslo.log can
provide fine wrapper for OpenStack projects.

Change-Id: Ibe57e503b88b39e284a9e4b11a1886cd4e8d4ccf

ironic_python_agent/inspector.py

@@ -16,12 +16,12 @@
 import base64
 import io
 import json
-import logging
 import tarfile
 
 import netaddr
 from oslo_concurrency import processutils
 from oslo_config import cfg
+from oslo_log import log as logging
 from oslo_utils import excutils
 from oslo_utils import units
 import requests