imsm: FIX: initalize reshape progress as it is stored in metatdata

imsm: FIX: initalize reshape progress as it is stored in metatdata

reshape prodess cannot be restarted due to no checkpoint information
in mdinfo.
When metadata is read during reshape process or reshape restart,
rehape_progress (mdinfo field) has to be initialized to value
stored in metadata. This allows start reshape from stored
in metadata checkpoint.

Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>