LU-16847 ldiskfs: refactor bio submit.

LU-16847 ldiskfs: refactor bio submit.

extract common code into osd_submit_bio() function to avoid
code duplication.
fix a debug output for the last bio, currently it lost from output.

HPe-bug-id: LUS-11645
Signed-off-by: Alexey Lyashkov <alexey.lyashkov@hpe.com>
Change-Id: I5f957a832b73ad08ccccfba7866393d93d4ae538
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51236
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Andrew Perepechko <andrew.perepechko@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>