Description of problem:

RuntimeManager adds OptimisticLockRetryInterceptor and TransactionLockInterceptor on top of SingleSessionCommandService$TransactionInterceptor on KieSession initialization.

But once a transaction is rolled back in later process execution, SingleSessionCommandService.commandService is overwritten by new TransactionInterceptor(kContext) in initExistingKnowledgeSession() hence the Interceptor stack is lost.

How reproducible:

Once a process execution transaction is rolled back, always reproducible. It could be serious in case of Singleton strategy because an application keeps using the ksession alive.

Steps to Reproduce:
1. Going to send a pull request.