Multiple Pool Manager - every PM is running periodic sync

[Kiall Mac Innes]

Multiple Pool Manager - every PM is running periodic sync/recovery - we should limit this to just a single instance at once.

Relates to bug 1445125

[Kiall Mac Innes (kiall)]

https://review.openstack.org/#/c/194626/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/194626
Committed: https://git.openstack.org/cgit/openstack/designate/commit/?id=1795db4f563f5e96e35e445e17248707958aaf66
Submitter: Jenkins
Branch: master

commit 1795db4f563f5e96e35e445e17248707958aaf66
Author: Kiall Mac Innes <email address hidden>
Date: Thu Jun 25 15:09:28 2015 +0100

    Ensure only one pool-manager performs periodic tasks

    Before, multiple pool managers on multiple physical or
    virtual machines would all run the periodic sync and
    recovery tasks, by implementing leader election, we
    ensure that only one pool manager, per pool, is running
    these tasks.

    Closes-Bug: 1445127
    Change-Id: I3c062d22db188fca5f74290a44ed6cf1741951b0