LU-7503 utils: add “--verbose|-v” option to “lfs migrate -m”

LU-7503 utils: add “--verbose|-v” option to “lfs migrate -m”

“lfs mv” has -v option to track the migration progress, which is
very useful for migrating big directory. However, the option is
missing while we changing “lfs mv” to “lfs migrate -m” in commit
849d7d5b1b4cabb7578c3ab5aaf271e90dd33864. This patch adds the option.

Signed-off-by: Jian Yu <jian.yu@intel.com>
Change-Id: I0729f74f46943736c6ed6ade46ca26aee905f550
Reviewed-on: http://review.whamcloud.com/17420
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>