app debug log did not output to log file when debug=True

[Liping Mao]

We can't see debug log(the debug log is produced by app.logger.debug(...) ) when debug=True in kuryr config file.

Looks like the flask debug log will output to log when app.debug=True.
http://flask.pocoo.org/docs/0.12/quickstart/

I think we can use oslo_log to instead of flask logger.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/441545

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/441545
Committed: https://git.openstack.org/cgit/openstack/kuryr-libnetwork/commit/?id=68789ceb2b910a505fc60ee52563b1cbd6d14920
Submitter: Jenkins
Branch: master

commit 68789ceb2b910a505fc60ee52563b1cbd6d14920
Author: Liping Mao (limao) <email address hidden>
Date: Sat Mar 4 11:09:30 2017 +0800

    Use oslo_log to instead of app.logger

    Change-Id: Ic1caa35e76acaae701855c5eda66e407e9ef6343
    Closes-bug: #1668558

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/447305

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/447305
Committed: https://git.openstack.org/cgit/openstack/fuxi/commit/?id=8bc3dbecfb8799a0f60e3d764d0d2b79dc1141e2
Submitter: Jenkins
Branch: master

commit 8bc3dbecfb8799a0f60e3d764d0d2b79dc1141e2
Author: Hongbin Lu <email address hidden>
Date: Sun Mar 19 11:45:49 2017 -0500

    Use oslo_log to instead of app.logger

    Change-Id: I7228402a86111925389396039a5ba444170a83ca
    Closes-Bug: #1668558

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/fuxi 0.2.0 release.