Possible fix for RS crash

Turning off block cache for regular full table scan and the coprocessor
count operation. This avoid these operations to add new block cache entries
in RS and evict the useful entries.

Ed atomic Testing has shown improvments in java memory usage in RS and in
throughput for large table full scans.

Change-Id: Ief1b9bb60c500100d3e63650b13cebfd99c2d041
Merge "Possible fix for RS crash"