FLUME-624: Fix Intermittent TestAgentSink

Review Request #1728 - Created April 30, 2011 and submitted

Jonathan Hsieh
old-flume
flume-624
flume
bruce.mitchener, esammer
this test failed intermittently because of a race condition.  The solution is to wait for the sub-thread to reach active state before returning from open.
Unable to duplicate race in debugger.  Test is passing in continuous integration for 20 runs.  
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