LU-5231 hsm: display file size in decimal not hex

LU-5231 hsm: display file size in decimal not hex

'lfs hsm_action' displays the file sizes in hex:
  somebigfile: ARCHIVE running (0xf1c00000 bytes moved)

This is not user friendly. Use decimal instead.

Remove the last occurences of LPX64 in lfs.

Signed-off-by: frank zago <fzago@cray.com>
Change-Id: Ib964c162b275bc836104cec3500a2f03c73dffeb
Reviewed-on: http://review.whamcloud.com/13678
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Henri Doreau <henri.doreau@cea.fr>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>