New Presplit utility for Fate table#6471
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closes issue #4979
Added support for pre-splitting Fate tables via accumulo admin command.
--numSplitsoption generates split points using the same partitioning logic as inFateManager.getDesiredPartitions. The logic ensures that pre-split boundires align with how the manger expects transaction IDs to be distributed. The split utility produces raw UUID row strings which should allow it be also be used by scan_ref.--splitsFileflag writes the generated splits to a file.