QPID-5255: Add missing licences to some Java Broker Management .html files (identified by Apache Rat).
This was previously committed to 0.24 under QPID-4961.

Merged from trunk with command:

svn merge -c 1551164 https://svn.apache.org/repos/asf/qpid/trunk/qpid



git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.26@1551168 13f79535-47bb-0310-9956-ffa450edef68