In BrokerPool, after shutting down the db, keep status == SHUTDOWN to avoid shutdown() being executed more than once. Fixes bug 1730342: NPE during shutdown (notificationService)
In BrokerPool, after shutting down the db, keep status == SHUTDOWN to avoid shutdown() being executed more than once. Fixes bug 1730342: NPE during shutdown (notificationService)

svn path=/trunk/eXist/; revision=6115

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