``django_openstack_auth`` code was merged into the main horizon
repository during the queens release. This repo is already
deprecated and now we can retire it. This patch removes all
references of ``django_openstack_auth`` as mentioned in [1].
Also, this patch takes care of step 2(End project Gating)
and and step 4(Remove Project) because
step 1(Stop requirements syncing) and step3(Remove Project Content)
is already handled by If04778ccc99ea92355378d59e616d8794e36ea14
and I74b10a90fe79fc768cfb8de6f68d3cd2f4938e51 respectively.
Note: this patch doesn't drop the official-openstack-repo-jobs template
and noop-job because noop-job is needs to be defined for the check and
gate queues to merge a patch and official-openstack-repo-jobs is needed
to syncup the changed in github repo once Ib811fb321d18fc01f3786f8b3ab16b2eda558864
merged we can drop this template and noop-job.
[1] https://docs.openstack.org/project-team-guide/repository.html#retiring-a-repository
Change-Id: Ifa691c2d2e7ac8bb502c8fae7dbdcc89fa4ef825
0cb4819d91