LU-3935 scrub: support dryrun mode OI scrub

LU-3935 scrub: support dryrun mode OI scrub

The administrator can detect whether there are any inconsistent
OI mappings but without repairing them via the command:

lctl lfsck_start --dryrun on -M <$device>

Under default mode, dryrun is "off". When the device is mounted,
the initial OI scrub will detect whether there are upgrade case,
or file-level backup/resotre case, or OI file(s) recreated case.
If found some inconsistency, it will trigger non-dryrun mode OI
scrub automatically. If the administrator does NOT want to such
auto non-dryrun OI scrub to avoid some unexpected repairing, he
(or she) can specify "-o noscrub" when mount the device.

Test-Parameters: testlist=sanity-scrub
Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: Ibab79c543dbb5b69789b688cacca10737a710f83
Reviewed-on: http://review.whamcloud.com/7867
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>