HORNETQ-1151 - avoiding NPE when deleting a queue and producing at the same time
Merge pull request #911 from clebertsuconic/Branch_2_2_EAP

HORNETQ-1151 - avoiding NPE when deleting a queue and producing at the s...
HORNETQ-1114 listMessagesAsJSON and countMessages JMX methods do not include paged messages

 Added a totalIterator() to iterate a queue's messages including those in the paging store.