Use oslo log for image_uploader as a library
Use oslo log for image_uploader as a library

When invoked via the tripleoclient command, honor the
--log-file options passed in and make the image_uploader module
to log into that file.

Poke default log levels for key events logged to meet oslo log
defaults.

Change-Id: I1c72b5ef0d7acbc4eded422d569f1383d92ad3c2
Signed-off-by: Bogdan Dobrelya <a2228ae37d00d1cbd5a93e53f3e1e5aef21d5900@redhat.com>

openstack/tripleo-common,openstack/tripleo-common