Revert "ISPN-4782 Drop the Mux Channel block in favour of a FORK protocol in the"

This reverts commit c150200b20018bbe9c2862764582b110abed6f59.
ISPN-4864 Drop the JGroups FORK protocol until we can properly support it
ISPN-4776 - The topology id for the merged cache topology is not always bigger than all the partition topology ids
Fix LargeClusterStressTest to create clustered caches and check the data
perf testing hacks