ISPN-5038 Remote package refactor

* fixed cross-site tests
ISPN-4992 Implement node statistics
ISPN-5056 Update Eclipse project import steps to include scala nature
ISPN-5053 Modules inheriting directly from the BOM use Java 1.5
ISPN-3353 AsyncReplExtendedStatisticTest.testReplace intermittent failure

* Wait for the command to be delivered in the remote nodes.
ISPN-3938 AdvancedAsyncCacheLoader.process() concurrency issues

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