PROTON-343: Removed proton-logging module and its usages (all of which are functionally insignificant),
so that the upcoming Proton 0.5 release does not contain this not-yet-prime-time module.

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1515455 13f79535-47bb-0310-9956-ffa450edef68