Replace HornetQ references in the quickstarts with ActiveMQ

Some quickstarts still reference HornetQ:

jts/README.md:
INFO [class org.jboss.as.quickstarts.cmt.jts.mdb.HelloWorldMDB] (Thread-2 (HornetQ-client-global-threads-2003471369)) Received Message: Created invoice for customer named: Tom
jts-distributed-crash-rec/README.md:

12:09:39,204 INFO [class org.jboss.as.quickstarts.cmt.jts.mdb.HelloWorldMDB] (Thread-3 (group:HornetQ-client-global-threads-649946595)) Received Message: Created invoice for customer named: Tom

messaging-clustering/remove-domain.cli:

1. 1. – Remove the HornetQ Clustering group