Add HR raft ticks as a hive config parameter

Change-Id: I4e7a92bf2a2fb457e738c31cc9884c9d9a8ca1e3
Change logic in kvstore benchmark

This commit change the logic of the kvstore benchmarks:
1) It creates the same set of keys for all workers.
2) Has one round of warmup.
3) Records the start and end time to measure throughput.

Change-Id: Idcf8105c12056b0e0c6301749ca405381dc234b5