LU-11848 filefrag: add -V option to print version

LU-11848 filefrag: add -V option to print version

Add '-V' to filefrag to print the installed version of the tool.

If '-V' is used twice, print out the list of supported FIEMAP flags.
This can be used to check if filefrag understands a specific feature.

Change-Id: Ib126bdd70efa1775aef6db761f54e27a593ebbe5
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/40873
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Wang Shilong <wshilong@whamcloud.com>