Added DaemonThreadFactory to avoid hanging in the tehuti application #29
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Previously, 'RedundantLogFilter' is using non-daemon thread to clean up the log filter, and it would result in stuck application if the application doesn't invoke 'RedundantLogFilter#shutdown', which is error prone. This PR adds a 'DaemonThreadFactory', so that the log filter threads won't block Tehuti application shutdown even it doesn't invoke 'RedundantLogFilter#shutdown' explicitly.