CLI implementation including OSC and neutorn CLI does not consume
oslo.log and use python logging directly. At now oslo.log is not
included in requirements.txt of both OSC and neutronclient and
CLI does not use features provided by oslo.log.
Let's use python logging.
Change-Id: I81e943fb87567f0e01635888bebf875ea42a4d02
Closes-Bug: #1676295