LU-3528 osd: check LOCAL sequence file in special directory

LU-3528 osd: check LOCAL sequence file in special directory

Check Local sequence file in special directory, otherwise
special file like fldb might be missing during upgrade.

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: I483151510b943ae9b9d9ba0b13f5ce67c4bfa5bb
Reviewed-on: http://review.whamcloud.com/8354
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>