Set max_microversion 2.35 for nova image tests

    1. The compute images API is deprecated from the Microversion 2.36,
       so we should set max_microversion = '2.35' for compute image tests.
    2. Compute image_create is not deprecated.
    3. In testcases other than those in compute/images, we can simply
       change to use glance images_client, which will also work before
       microversion 2.35.

ref: https://developer.openstack.org/api-ref/compute/#list-images
     https://developer.openstack.org/api-ref/compute/#create-image-createimage-action

Implements blueprint: clear-deprecated-api

Change-Id: I7a40d26449a361f0e3ec922ac41a7c522b572803
12 files changed