make start/stop scripts can work on both ubuntu and centos

Signed-off-by: ywang19 <yaguang.wang@intel.com>
remove log files in log folder

Signed-off-by: ywang19 <yaguang.wang@intel.com>
add tooltip for auth/storage parameters

Signed-off-by: ywang19 <yaguang.wang@intel.com>
add default driver.conf

Signed-off-by: ywang19 <yaguang.wang@intel.com>
Merge branch '0.4.0.1' of https://github.com/intel-cloud/cosbench into 0.4.0.1
FIX issue #154: Add authentication caching support

Signed-off-by: ywang19 <yaguang.wang@intel.com>