QPID-6291: [Java Broker] Remove the now defunct supported attributes: VH#supportedExchangeTypes, VH#supportedQueueTypes, Broker#supportedAuthenticationProviders, Broker#supportedPreferencesProviderTypes

Clients now can discover the supported attributes in a generic fashion via the metadata service.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1648392 13f79535-47bb-0310-9956-ffa450edef68