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Busybox ping exhibited intermittent failures some time back so we had
switched to using the debian image for ping testing, however we are now
seeing intermittent failures in the busybox nslookup results as well.
This appears to be dependent on the order in which A and AAAA record query
results are returned as those queries appear to be issued in parallel.
The debian nslookup does not issue an AAAA query by default and does not
exhibit this problem however is not available in the base image. As such we've
pinned the busybox version to 1.28.4 until the bug is fixed.
See docker-library/busybox#48
Also updates all images used in the test to use the image variable rather than
hardcoded names so we use the local mirrors if configured.