SIGHUP: glance_control should really reload rather than stop/start

[Stuart McLaren]

Currently 'glance_control reload' does a service stop/start. Instead it should send a SIGHUP to trigger the service to reload its configuration (and preserve any in-flight requests).

[Stuart McLaren (stuart-mclaren)]

https://review.openstack.org/#/c/130222/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/130222
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=0c7f1721177762b9f8fec9e9bfa3249aaeeecdc0
Submitter: Jenkins
Branch: master

commit 0c7f1721177762b9f8fec9e9bfa3249aaeeecdc0
Author: Stuart McLaren <email address hidden>
Date: Tue Oct 21 16:59:43 2014 +0000

    Zero downtime config reload (glance-control)

    Update glance-control to send a SIGHUP rather than
    perform a start/stop for the 'reload' operation.

    This allows picking up new configuration values without
    interrupting the service.

    Closes-bug: 1436275
    Change-Id: I5a653daa3e582b665c0a2c402cf2d7c9e47e1c38