#14 add log4j logging

[Steve Strassmann]

Request: add support for log4j logging.

You can turn logging on/off by setting a property, instead of having to recompile. It will also support standard log-viewing tools like logmx and splunk.

You should be able to set the log level to trace XML traffic (equivalent of VpxClient -log +sd)

[Nobody/Anonymous]

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