'rados bench' in RHCS1.3 prints time in nano-second accuracy, thus rendering the output unreadable.

Issue

• The command 'rados bench' is used to measure the performance of a Ceph cluster by writing data to the underlying OSD disks.

• rados bench prints the time in nano-second accuracy which makes it unreadable in certain circumstances.

• An example:

2016-04-28 09:00:01.136545min lat: 0.00182504 max lat: 16.7497 avg lat: 0.0904326

• In the above example, 'min lat:' is seen appended to the time '09:00:01.136545', which makes it difficult to read and understand.