This commit is related to:

 LBCLASSIC-83 (Logger.setLevel(null) may throw an NPE)

 LBCLASSIC-61 (configurable ObjectName)
 LBCLASSIC-24 (better error messages after reload)
 LBCLASSIC-33 (JMX configurator unregisters itself)
 LBCLASSIC-78 (NPE in JMXConfigurator getLoggerLevel)
 LBCLASSIC-79 (NPE in JMXConfigurator setLoggerLevel)
 

While testing LBCLASSIC 61,24 and 33, I wanted to correct LBCLASSIC-78
and LBCLASSIC-79 which are related to JMXConfigurator. It turns out
that LBCLASSIC-79 has a much deeper cause identified in LBCLASSIC-83.

Work on LBCLASSIC 61,24 and 33 is still ongoing. The present commit
reflects the nature of that ongoing and incomplete work.