LU-7428 osd: set device read-only correctly

LU-7428 osd: set device read-only correctly

Freeze the journal before setting device read-only to prevent
starting a new handle or commit a transaction in that time.

Seagate-bug-id: MRP-2135

Some of the patch is from http://review.whamcloud.com/20535

Change-Id: Iadcb0a7ccf9189e8bb564aa4783bae9a2ef86a76
Signed-off-by: Alexey Lyashkov <alexey.lyashkov@seagate.com>
Signed-off-by: vinayakswami hariharmath <vinayakswami.hariharmath@seagate.com>
Signed-off-by: Gu Zheng <gzheng@ddn.com>
Signed-off-by: Hongchao Zhang <hongchao.zhang@intel.com>
Reviewed-on: http://review.whamcloud.com/20586
Reviewed-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>