There are no remaining heat tests which require heat-cfntools on the test image, so orchestration tests can just use [compute] image_ref (AKA cirros). test_neutron_resources has been modified to use curl instead of cfn-signal. This will close tempest bugs where fedora boot times out in general gate jobs. Change-Id: Ic70c4b5859183b9ebc716dec3095cefc62be5af7 Closes-Bug: #1430524