OAK-641: Improved benchmark tooling

Uniform cache size settings (bundle cache for Jackrabbit, KernelNodeState cache for the MicroKernel and segment cache for SegmentMK)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1461532 13f79535-47bb-0310-9956-ffa450edef68