Changed assertions to use test framework assertions
Fixed SKIP_REMOTE_STORE to only mean when persisting entries
ISPN-4820 Change Size method on Cache to return the contents of the
entire cluster

* SizeCommand now uses entry iterator
ISPN-3938 AdvancedAsyncCacheLoader.process() concurrency issues

Simplify ExecutorAllCompletionService to track the tasks itself instead of
using an ExecutorCompletionService.