The Ceph upgrade test is the only one which uses the
`WaitForDeploymentImage` method, and it has to be configured to wait
longer after upgrade at this point. Since the wait time is still
hard-coded, this method is moved to the operator's test dir to make
it clear that the method is suitable only for tests currently.
Signed-off-by: Blaine Gardner <blaine.gardner@suse.com>