LU-16599 obdclass: job_stats can parse escaped jobid string

LU-16599 obdclass: job_stats can parse escaped jobid string

Writing a jobid to job_stats proc entry asks lustre to clear
the stats of the specific jobid. Since job_stats outputs
escaped jobid string in some cases, it should be able to parse
an escaped jobid string when the string is written to it.

Test-Parameters: trivial
Signed-off-by: Lei Feng <flei@whamcloud.com>
Change-Id: Idbc63dac6c3b35331317927107e634a3d638dd66
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50160
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>