Replace directly import of logging with import oslo_log

The oslo.log (logging) configuration library provides standardized
configuration for all openstack projects. It also provides custom
formatters, handlers and support for context specific
logging (like resource id's etc).

It is better to use the common logging module.

Change-Id: I45933a0256e71f3d51e7b5f4ef5de782e2fa27cf
3 files changed