Comment 3 for bug 1464822

Reviewed: https://review.openstack.org/191515
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=fcb5068e79490351359afdec9f05f42ebb022edf
Submitter: Jenkins
Branch: master

commit fcb5068e79490351359afdec9f05f42ebb022edf
Author: Mitsuhiro Tanino <email address hidden>
Date: Sat Jun 13 00:23:40 2015 -0400

    Wait until service thread is done on service stop

    In order to be able to perform graceful shutdown of services, we need
    to wait for all the current service threads to finish before exiting
    from the service process.

    Oslo.service provides this facility through it's wait() method, so we
    need to call it in Cinder Service stop() method which gets called when
    graceful shutdown is requested by sending the process SIGINT or SIGTERM.

    Partial-Bug: 1464822
    Change-Id: I972b80251cebe353f9d89ff4e05db8d029ef5e73