QPID-4755: Rename broker attribute 'supportedStoreTypes' into 'virtualHostSupportedStoreTypes' and introduce new attribute for broker supported store types

merged from trunk r1469917


git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.22@1469944 13f79535-47bb-0310-9956-ffa450edef68