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.

merged from trunk r1468815


git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.22@1469909 13f79535-47bb-0310-9956-ffa450edef68