If glance refuses to allow bad images to be uploaded, then we cannot
even register them to then test against nova or other services. Gate
these tests on a knob indicating whether or not glance will allow
them to be uploaded. The ListUserImagesTest class depends entirely on
being able to upload random data as every format/container, which is
fundamentally not something we can do with glance enforcing content
rules.
This makes the tempest-slow-py3 job disable glance image format
inspection so that we can get the compute tests to run.
Depends-On: https://review.opendev.org/c/openstack/devstack/+/931026
Change-Id: I05bb233cf1482895b96396852a15532295d3829b
2ba7ed8e39