[Bug 1899064] Re: Decrease time_threshold for zone_purge task.

[Alex Kavanagh]

** Changed in: charm-designate
    Milestone: None => 20.10

** Changed in: charm-designate
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1899064

Title:
  Decrease time_threshold for zone_purge task.

Status in OpenStack Designate Charm:
  Fix Released
Status in designate package in Ubuntu:
  New

Bug description:
  [Environment]

  Ussuri
  Charms 20.08 

  [Description]

  After deleting a zone on a designate-bind backend, the zone
  remains active until the zone purge producer task gets executed.

  $ openstack zone show 98c02cfb-5a2f-xxxx
  Could not find Zone

  $ openstack zone delete 98c02cfb-5a2f-xxxx
  Could not find Zone

  mysql> select * from zones where id="98c02cfb-5a2f-xxxx";
  Empty set (0.01 sec)

  
  363:2020-09-25 05:23:41.154 1685647 DEBUG designate.central.service [req-8223a934-84df-44eb-97bd-a0194343955a - - - - -] Performing purge with limit of 100 and criterion of {u'deleted': u'!0', u'deleted_at': u'<=2020-09-18 05:23:41.143790', u'shard': u'BETWEEN 1365,2729'} purge_zones /usr/lib/python2.7/dist-packages/designate/central/service.py:1131

  No zone was found by this criteria, therefore, the hard delete zone from the database https://github.com/openstack/designate/blob/2e3d8ab80daac00bad7d2b46246660592163bf17/designate/storage/impl_sqlalchemy/__init__.py#L454
  didn't apply.

  This delta is governed by time_threshold https://github.com/openstack/designate/blob/89435416a1dcb6df2a347f43680cfe57d1eb0a82/designate/conf/producer.py#L100
  which is set to 1 week.

  ### Proposed actions

  1) Make the time_threshold shorter to a 1 hour span by default.
  2) Don't list deleted_at zones in designate list operation.

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