QPID-2243, QPID-3658: update test to fix incorrect assumption that messages have already reached the broker Applied patch from Oleksandr Rudyy<orudyy@gmail.com> and myself.
qpid/trunk/qpid/java/systests/src/main/java/org/apache/qpid/management/jmx/ManagedConnectionMBeanTest.java