1. For non-FIPS builds, lower the entropy request size to the old value.
2. Added a consistency check to the result of the entropy source. The test
involves requesting an additional 64-bits, then doing a running
comparison of each block of 64-bits. The first block of bits is ignored.
3. Refactored the RNG seeding a bit. Renamed all variables with
"entropy" in the name as "seed". Renamed the constants for entropy sizes
as seed sizes. Changed the security strength to its actual value and
introduced an entropy scaling factor for the number of bits of entropy
per bit and a size for the NDRBG block size.
4. Changed it so the user can change the parameters for the RNG at the
build configuration. If using FIPSv2, triggers an error if the paramters
are changed.
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