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.
Merge pull request #912 from clebertsuconic/Branch_2_2_AS7

HORNETQ-1151 - avoiding NPE when deleting a queue and producing at the s...
Merge pull request #913 from gaohoward/Branch_2_2_AS7

HORNETQ-1114 listMessagesAsJSON and countMessages JMX methods do not inc...
Merge pull request #919 from clebertsuconic/Branch_2_2_AS7

fixing test that are failing after topic=null change
another test fix avoiding NPE on queue