Set # partitions of WAL & block cache in ForestDB to 31
Set # partitions of WAL & block cache in ForestDB to 31

couchbaselabs/ForestDB-Benchmark,yyangpan/ForestDB-Benchmark,yyangpan/ForestDB-Benchmark,yyangpan/ForestDB-Benchmark,couchbaselabs/ForestDB-Benchmark