QPID-4731: Implemented JMSSelectorFilter equals() and hashcode() to avoid leaking topic queues. Previously TopicExchangeResult._filteredQueues look-ups in TopicExchangeResult.removeFilteredQueue were erroneously failing, causing the queues therein to evade deletion during topic consumer close.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1468815 13f79535-47bb-0310-9956-ffa450edef68
QPID-4731: Added additional system test DurableSubscriptionTest#testUnsubscribeWhenUsingSelectorMakesTopicUnreachable that surfaced the defect

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1468816 13f79535-47bb-0310-9956-ffa450edef68