Co-authored-by:  @agingade 

LoggingUnhandledExceptionHandler creates a single handler that logs
to a static logger. All geode threads should use this singleton.
ThreadHelper should be used when creating a Thread.
It will automatically set a LoggingUnhandledExceptionHandler on the thread.
NamedThreadFactory makes it easy to create a ThreadFactory instance that
uses ThreadHelper and gives each thread a unique name.

This checkin uses these new classes in every place the previously used
LoggingThreadGroup. The code should also be reviewed for other places
we create Thread or ThreadFactory instances without using the 
LoggingThreadGroup.

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[ Full content available at: https://github.com/apache/geode/pull/2535 ]
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