Designate documents don't have updated_at default date

[Travis Tripp]

See also: https://review.openstack.org/#/c/226524/

OS::Designate::Zone
OS::Designate::Recordset

The above have created_at and updated_at field, but by default the updated_at is only set after it is actually updated. This means there isn't a value on initial creation, making sorting more difficult.

It seems that perhaps we should be setting updated_at to created_at by default if updated_at doesn't have a value.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/229169

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/229169
Committed: https://git.openstack.org/cgit/openstack/searchlight/commit/?id=ec93305cd347dd2968ccbb1af2bd6d72d1e6164f
Submitter: Jenkins
Branch: master

commit ec93305cd347dd2968ccbb1af2bd6d72d1e6164f
Author: Steve McLellan <email address hidden>
Date: Tue Sep 29 17:25:02 2015 -0500

    Default designate updated_at to created_at

    If 'updated_at' is not set for a designate zone or recordset,
    default it to 'created_at'.

    Change-Id: I900fb6290263dc655783f1be3f3130460154f41e
    Closes-Bug: #1500958