tests/functional: skip tests if assets are not available If downloading of assets has been disabled, then skip running a test if the assets it has registered are not already downloaded. Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-ID: <20241217155953.3950506-31-berrange@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>