Assemble: include ACTIVE but not in-sync devices as non-spares.

Assemble: include ACTIVE but not  in-sync devices as non-spares.

Previously such things did not exist: ACTIVE and SYNC were either both
set or both clear.   Recent changes with reshape means that a device
can be ACTIVE but not yet fully in-sync, so they need to be handled
and included in the array as active devices.

Signed-off-by: NeilBrown <neilb@suse.de>