After 7052b7f065 merged in openstack/horizon a new Unit
test class introduced in horizon i.e. RestAPITestCase.
This patch updates heat-dashboard to import RestAPITestCase
class instead of TestCase. For more info. see [1]
It also update few packages version in lower-constraints.txt and
other files to fix lower-constraints job.
[1] https://review.opendev.org/c/openstack/horizon/+/827097/2/openstack_dashboard/test/helpers.py#485
NOTE: py36 support has been dropped for Zed, so py36 UT no longer works
with upper-constraints for Zed. Thus, the zuul job template is updated
for Zed in this commit together. This commit also needs to be backported
to stable/yoga to fix the UT. When backported, make sure not to include
the zuul template change for Zed.
Co-Authored-By: Akihiro Motoki <amotoki@gmail.com>
Change-Id: I81241b2225f1e8b7b38f8f03928d5b4c0b4c8094
68f5d8c494