fix issue #223 to enable retry logic for auth caching

Signed-off-by: ywang19 <yaguang.wang@intel.com>
Merge pull request #224 from xiaoerlyl/0.4.1.0

0.4.1.0
update version to 0.4.1

Signed-off-by: ywang19 <yaguang.wang@intel.com>
Fix issue #222: completed operation count is mismatching with configured totalOps

Signed-off-by: ywang19 <yaguang.wang@intel.com>
optional configuration for generating histogram
resolve 409
Merge branch '0.4.1.0' of https://github.com/xiaoerlyl/cosbench into 0.4.1.0
optional configuration for generating histogram