LU-13980 osd-ldiskfs: print label instead of device

LU-13980 osd-ldiskfs: print label instead of device

Print out the volume label (e.g. fsname-OST0000) in error messages
instead of the device name (e.g. dm-2) so that it is easier to
correlate this with other messages in the log.

Fix error strings to be on one line to match code style.

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Iff31bc962ca32b1f3a13f579700d03835a3ebbe5
Reviewed-on: https://review.whamcloud.com/40738
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Wang Shilong <wshilong@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>