Problems with parallel agenda

From doc [1] there can be seen that four benchmarks show problems when run with parallel agenda enabled.

Benchmarks AdvOperators3ExpertBenchmark and RetractFactsFromWmExpertBenchmark
falled back to single threaded agenda although they doesn't use features that aren't supported with parallel agenda (e.g. like salience).

Benchmarks StartsStartedbyFusionBenchmark and UpdateFactsInWmExpertBenchmark shows no gain when using parallel agenda although they contain more partitions.

I created runners for debugging here [2], so the benchmarks can be debugged outside of JMH. They are part of master branch in kie-benchmarks, so just pull of new changes is sufficient to get them.

[1] https://docs.google.com/a/redhat.com/spreadsheets/d/1hp5lLcmox_NFEUsqNSNZBW2XvkrJWgj0LtEiVvbsCYU/edit?usp=sharing
[2] https://github.com/kiegroup/kie-benchmarks/commit/887f758931b02d096f1e870a3145119db315e1af