imsm: load_imsm_super_all supports loading metadata from the device list
This option is going to be used to load and analyse the metadata from
devices. This is needed to count the number of volumes on devcies attached
to particular Intel controller (SATA or SAS). It shall be done without
activation of container and volumes on the devices.
Signed-off-by: Marcin Labun <marcin.labun@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>