cacher: Use PodList type for use in GetList
cacher: Use PodList type for use in GetList

Using a Pod type in a GetList() call in a test
can panic at worst and error out at best. Here,
neither happened because the error condition
being tested for (cacher being stopped or not)
gets returned before the list pointer can be
enforced.

This commit changes the above to use PodList.

Signed-off-by: Madhav Jivrajani <madhav.jiv@gmail.com>

Kubernetes-commit: 487761f4e2543114db158f0d59e598dedc481882

kubernetes/apiserver,kubernetes/apiserver