FLUME-1899 - Make the spool directory source work with sub directories
Review Request #12211 - Created July 1, 2013 and updated
Added recursive directory walking to the ReliableSpoolingFileEventReader. the same ignore pattern is used against the sub-directory names as well.
Added new unit test, local testing on windows and CentOS. By default the setting is not enabled, need to update configuration i.e. spool-agent.sources.spooler.recursiveDirectorySearch = true