SLING-3037 - IllegalArgumentException in logback Logger

Updating the Logback dependency to 1.1.0 version which contains the fix for LOGBACK-384

-- Removed the locally patched copy of LoggerNameUtil
-- The packages are now exported at version 1.1.0

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1563778 13f79535-47bb-0310-9956-ffa450edef68