Move any useful info from the wiki to the docs

[Dougal Matthews]

https://docs.openstack.org/mistral/latest/contributor/debug.html

In some places, at least the above URL, we link to the Mistral wiki. We should remove these links, move over the content if it is still good and retire the wiki pages.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/703913

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/703920

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/703959

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/703913
Committed: https://git.openstack.org/cgit/openstack/mistral/commit/?id=5c05636ee45bc79d99a7a90d972035f819619d0a
Submitter: Zuul
Branch: master

commit 5c05636ee45bc79d99a7a90d972035f819619d0a
Author: Renat Akhmerov <email address hidden>
Date: Thu Jan 23 11:41:28 2020 +0700

    Move "Cloud Cron" cookbook from Wiki to the built-in docs

    * Since Mistral Wiki has been retired we need to move all important
      info published there into the docs residing in the project repo.
      This patch moves the article published at
      https://wiki.openstack.org/wiki/Mistral/Cookbooks/AdministrationCloudCron
      to the docs.

    Change-Id: I4764fb3beba1ff05091a4ce04c93fe56d39528d5
    Partial-Bug: #1779318

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/703920
Committed: https://git.openstack.org/cgit/openstack/mistral/commit/?id=12b2eceb358481d5f63e4c19d5961d1f8373e75a
Submitter: Zuul
Branch: master

commit 12b2eceb358481d5f63e4c19d5961d1f8373e75a
Author: Renat Akhmerov <email address hidden>
Date: Thu Jan 23 13:36:33 2020 +0700

    Move FAQ from Wiki to the built-in docs

    * This patch moves the list of frequently asked questions from
      https://wiki.openstack.org/w/index.php?title=Mistral&oldid=152120
      to the docs. However, it makes some changes because some info
      is already outdated.

    Change-Id: I55a80ed2906bb3fae101d9adc044ed028b6a9d24
    Partial-Bug: #1779318

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/703959
Committed: https://git.openstack.org/cgit/openstack/mistral/commit/?id=9dfdd20541cbe3e862428eacea6c4d552ea4120c
Submitter: Zuul
Branch: master

commit 9dfdd20541cbe3e862428eacea6c4d552ea4120c
Author: Renat Akhmerov <email address hidden>
Date: Thu Jan 23 17:14:02 2020 +0700

    Move the article about testing from Wiki to the built-in docs

    * Significant part of the original article is outdated
      (https://wiki.openstack.org/wiki/Mistral/Testing) so only the actual
      parts were moved.

    Partial-Bug: #1779318

    Change-Id: Ia5a43db418282041c6e169e301528ef1a35777af

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/704100

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/704100
Committed: https://git.openstack.org/cgit/openstack/mistral/commit/?id=6928615fde51520faf45b89d068b9ba7db99352d
Submitter: Zuul
Branch: master

commit 6928615fde51520faf45b89d068b9ba7db99352d
Author: Renat Akhmerov <email address hidden>
Date: Fri Jan 24 11:55:55 2020 +0700

    Move "Long Running Business Process" article from Wiki to docs

    * Moved from
      https://wiki.openstack.org/wiki/Mistral/Long_Running_Business_Process

    Change-Id: I573a7dc6079c7218c7d0dd38385db5cece07f0d4
    Closes-Bug: #1779318

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/mistral 10.0.0.0b2 development milestone.