Remove new_id() in test_revoke
Remove new_id() in test_revoke

Since new_id() and uuid.uuid4().hex there is no need for two different
lines of code which do the same thing. Removing new_id() makes the
code more consistant and easier for readability purposes.

Change-Id: Iff214099e82a9ade2f07e458e35932441f1d12eb

rajalokan/keystone,openstack/keystone,ilay09/keystone,mahak/keystone,mahak/keystone,ilay09/keystone,rajalokan/keystone,rajalokan/keystone,mahak/keystone,ilay09/keystone,openstack/keystone,openstack/keystone