Comment 1 for bug 1799163

Reviewed: https://review.openstack.org/611637
Committed: https://git.openstack.org/cgit/openstack/compute-hyperv/commit/?id=f6c6dbdf9da59e6cfff9e64590765c9066857530
Submitter: Zuul
Branch: master

commit f6c6dbdf9da59e6cfff9e64590765c9066857530
Author: Lucian Petrut <email address hidden>
Date: Thu Oct 18 17:23:27 2018 +0300

    Refactor instance state change event handler

    We ended up having too much logic in the event handler. This change
    trims it down, making it easier to add callbacks.

    The actions taken when receiving events are now moved out of the
    event handler, being registered as callbacks.

    Related-Bug: #1799163
    Change-Id: Ie93aa0e184c5ff9daef4e857e212bb54e9473a78