PROTON-192 - move new ProtonJ* interfaces to their respective api package

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/branches/jni-binding@1438608 13f79535-47bb-0310-9956-ffa450edef68
PROTON-192: revert import statement reorderings in contrib code to avoid diff-noise

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/branches/jni-binding@1438610 13f79535-47bb-0310-9956-ffa450edef68