LU-7567 utils: fix timestamp printing in lfs_changelog()

lfs_changelog() should use ".09d" when printing the fractional part
instead of ".06d" for accurate timestamps.

Test-Parameters: trivial
Signed-off-by: akam kumar bharathi <azurelustre@gmail.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I2b219f588de688ba06b3c8cf3ccd255ed845c45e
Reviewed-on: https://review.whamcloud.com/18006
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>