"tags" query argument filters everything out

[Xavier Hardy]

curl http://localhost:9000/v2/workflows?fields=id,name&limit=25&tags=test

```
<result><workflows/></result>
```

Even though we have a workflow with only a `test` tag.

Having a list of tags should filter the workflows with at least all of those tags.

[Dougal Matthews (d0ugal)]

The code to look at is here: https://github.com/openstack/mistral/blob/392b3958dc33046516c80c30688e30c32497e839/mistral/db/v2/sqlalchemy/filters.py#L48-L62

[Dougal Matthews (d0ugal)]

There is a workaround in tripleo for this bug: http://git.openstack.org/cgit/openstack/tripleo-heat-templates/tree/extraconfig/post_deploy/undercloud_post.sh#n117

Added in https://review.openstack.org/#/c/551009/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/559943

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/559943
Committed: https://git.openstack.org/cgit/openstack/mistral/commit/?id=be2bfe744c7f164f1be94d12ff5672cbe4e4d04f
Submitter: Zuul
Branch: master

commit be2bfe744c7f164f1be94d12ff5672cbe4e4d04f
Author: Adriano Petrich <email address hidden>
Date: Tue Apr 10 08:55:02 2018 +0100

    Fix tag searching

    When python-mistralclient filters it passes a dictionary not just the
    string. This clears the dictionary and fix the search parameters into
    lists for multiple tags to be searched if separeted by commas
    like:

    openstack workflow list --filter tags=tripleo-common-managed,foo

    Change-Id: Ie082901fd7eb8b61a6306da1275a79aeb6c4a6de
    Closes-Bug: #1716648

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/mistral 7.0.0.0b1 development milestone.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Dougal Matthews (<email address hidden>) on branch: master
Review: https://review.openstack.org/505206
Reason: Abandoning this patch per the Mistral Patch Abandonment guidelines
(https://specs.openstack.org/openstack/mistral-specs/specs/policy/patch-abandonment.html).
If you wish to have this restored and cannot do so yourself, please reach
out via #openstack-mistral on freenode or the OpenStack Dev mailing list.