[reSIProcate] additions to rutil/Random & performance results

[Kennard White]

Hi,

I added a couple different threading behaviors to rutil/Random. I wrote a
test program to measure performance, and ran it on two different Linux
platforms. I wrote up results here:
http://www.resiprocate.org/Random_number_generation

Patches are attached. I plan to commit to SVN this Friday. The new threading
modes are NOT enabled by default. The patch does slightly change the seeding
algorithm under POSIX even in the default case.

Kennard
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