WL#603: Optimized DiskIO handling for new keycache
There are some tricks which can improve IO performance of Keycache for some workloads 1) Index pages should be alligned index page size as this can be used to match them to File system block size and raid chunk size. In 5.0 we should add support to specify index block size per index. 2) IO for larger blocks shall be done the same as the block size, instead of key cache block size. This removes the need for file system to read the block before writing it back, for large blocks. 2) Is already done with the new key cache in 4.1
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