Add service dynamic log change/query

[OpenStack Infra]

https://review.openstack.org/445885
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/cinder" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit a60a09ce5fec847ee4af1cf2661f04ad15459c98
Author: Gorka Eguileor <email address hidden>
Date: Mon Mar 13 18:35:40 2017 +0100

    Add service dynamic log change/query

    This patch adds 2 new APIs for microversion 3.32, one to dynamically
    change the log level of cinder services, and the other that allows
    querying their current log levels.

    DocImpact
    APIImpact
    Implements: blueprint dynamic-log-levels
    Change-Id: Ia5ef81135044733f1dd3970a116f97457b0371de