Switch to LOGGER.catching(Level.DEBUG, e).

  - This changed from TRACE to ERROR at some point, and all these usages were really more of a debug usage than an actual error.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1587454 13f79535-47bb-0310-9956-ffa450edef68