PROTON-343: moved JUL and SLF4J loggers to proton-logging module, and made StdOutCategoryLogger
the default (and adding configurability to it).

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1501734 13f79535-47bb-0310-9956-ffa450edef68