FLUME-280: '+=' operation doesn't work in for bash-3.0-x

Review Request #1265 - Created Dec. 2, 2010 and submitted

Jonathan Hsieh
old-flume
flume-280
flume
esammer, phunt, todd
+= doesn't work in bash scripts for rhel 4.  
ran 'flume version', 'flume node' and 'flume master' and looks like it works.
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