QPID-5610: create initial dir to move broker plugin source into

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/QPID-5610-maven3-build-qmf-tools@1578022 13f79535-47bb-0310-9956-ffa450edef68
QPID-5610: move src/qpid-broker-plugins-management-qmf2/java -> qpid-broker-plugins-management-qmf2/src/main/java

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/QPID-5610-maven3-build-qmf-tools@1578023 13f79535-47bb-0310-9956-ffa450edef68