ReplicationFanoutIT: Cleanup shouldCreateIndividualReplicationTasksForEveryRemoteUrlPair

Remove some dead code, use Integer.MAX_VALUE for the replicationDelay so
that tasks stay in the waiting/ area of storage for the entire test, and
use a dedicated listWaitingTasks() to show it only depends on tasks in
that state.

Change-Id: I0035a4edc656ed4833249322c45204124a66e20d