QPID-5138: Add UI into web management console for creation and editing preferences providers

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1523220 13f79535-47bb-0310-9956-ffa450edef68
QPID-5138: Add preferences REST interfaces to get, set and delete preferences

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1523221 13f79535-47bb-0310-9956-ffa450edef68