Remove retired qinling-dashbaord usage
Remove retired qinling-dashbaord usage

Qinling project is retiring in Wallaby cycle[1].
This commit removes the usages/support of qinling-dashboard
before its code is removed.

Needed-By: https://review.opendev.org/c/openstack/qinling-dashboard/+/764522

[1] http://lists.openstack.org/pipermail/openstack-discuss/2020-November/018638.html

Change-Id: Id143db0e985c7b53cbb16e89547765ad02beed4d

openstack/horizon,openstack/horizon,openstack/horizon,ChameleonCloud/horizon,ChameleonCloud/horizon,ChameleonCloud/horizon,ChameleonCloud/horizon,openstack/horizon