Fix test for imsm prodigal member scenario

The 'container_enough' changes fliped the default from assembling
an array as soon as we possibly could, to assembling only when all
expected devices are present.
This broken 09imsm-assemble which expects the original default.
So change from "-I" to "-IR" to restore the expected behaviour.

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

tests/09imsm-assemble

@@ -9,19 +9,19 @@ mdadm -Ss
 
 # make dev0 and dev1 a new rebuild family
 mdadm -A $container $dev0 $dev1
-mdadm -I $container
+mdadm -IR $container
 mdadm --wait ${member}_0
 mdadm -Ss
 
 # make dev2 and dev3 a new rebuild family
 mdadm -A $container $dev2 $dev3
-mdadm -I $container
+mdadm -IR $container
 mdadm --wait ${member}_0
 mdadm -Ss
 
 # reassemble and make sure one of the families falls out
 mdadm -A $container $dev0 $dev1 $dev2 $dev3
-mdadm -I $container
+mdadm -IR $container
 testdev ${member}_0 1 $size 1
 if mdadm --remove $container $dev0 ; then
     # the dev[23] family won
@@ -38,9 +38,9 @@ mdadm -Ss
 
 # reassemble with a new id for the dev[23] family
 mdadm -A $container $dev0 $dev1
-mdadm -I $container
+mdadm -IR $container
 mdadm -A ${container}2 $dev2 $dev3 --update=uuid
-mdadm -I ${container}2
+mdadm -IR ${container}2
 
 testdev ${member}_0 1 $size 1
 testdev ${member}_1 1 $size 1