https://issues.jboss.org/browse/HORNETQ-1296 DeliveringCount and MessageCount can go negative Test

Test scenario added
Fixed https://issues.jboss.org/browse/HORNETQ-1296 DeliveringCount and MessageCount can go negative, prevented now

Only decremented delivery count in valid cases
Merge pull request #1453 from clebertsuconic/patch-happyviral

https://issues.jboss.org/browse/HORNETQ-1296