The floating point rounding performed by the ap_snprintf() was throwing

off the distribution of the random value. The much simpler forms works
just as well, and provides a normal distribution.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84156 13f79535-47bb-0310-9956-ffa450edef68