Comment 4 for bug 1552845

Reviewed: https://review.openstack.org/288908
Committed: https://git.openstack.org/cgit/openstack/zaqar/commit/?id=897424af777b10e2c8e79f79de6f7e5a37b096c5
Submitter: Jenkins
Branch: master

commit 897424af777b10e2c8e79f79de6f7e5a37b096c5
Author: Eva Balycheva <email address hidden>
Date: Sat Mar 5 06:28:34 2016 +0300

    Show 'age' field in subscriptions (redis)

    We recently fixed subscriptions and now they are expirable resources as
    they should be.

    This patch adds 'age' field to subscription resource representation
    which is exposed to the user and defined in redis driver.

    This patch also removes existing 'expires' field, because:
    1. The 'expires' field is missing in mongodb's subscription resource
    representation. (But age field was also missing until a recent patch).
    2. The 'expires' field has int (timestamp) format, which is not human
    readable.
    3. Other Zaqar's expirable resources show 'age' and 'ttl' fields instead
    of showing 'expires' field.
    4. There is no need in 'expires' field when 'age' and 'ttl' fields are
    exposed to the user.

    This change in unlikely to affect backward compatibility, because
    subscription expirations started to work only recently.

    Closes-Bug: 1552845
    APIImpact
    DocImpact
    Change-Id: I18f908b2f137bd4b8e5b3d3275063a1d37942093