Let CacheCluster return the right hit and access count

Hello @nicks, 

Please review the following commits I made in branch 'xiao-fix-CacheCluster-counts'.

4e2b9c880add251a38d1976b4e34ba5fd55a9cea (2014-02-16 22:43:37 -0800)
Let CacheCluster return the right hit and access count

R=@nicks