[reSIProcate] DataStream and fast stream modifications

[Byron Campen <bcampen@xxxxxxxxxxxx>]

	make check started failing on mainline resip in revs 8161 and 8162  
(the fast-stream modifications). testDigestAuthentication and  
testParserCategories are both failing. It appears that this is being  
caused by lack of calls to DataStream::flush() in the test-cases, but  
I will see if this is the entire problem.

Best regards,
Byron Campen

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