tests: increate delay for raid rebuild

Delay writes just to usable extents on a PV
(so lvm2 metadata update remains fast).
Raise delay to 10ms for write.

test/shell/lvchange-rebuild-raid.sh

@@ -19,9 +19,9 @@ aux have_raid 1 3 2 || skip
 aux prepare_vg 8
 
 # Delay 1st leg so that rebuilding status characters can be read
-for d in "$dev1" "$dev2" "$dev3" "$dev4" "$dev5" "$dev6" "$dev7" "$dev8"
+for d in $(< DEVICES)
 do
-	aux delay_dev $d 0 3
+	aux delay_dev "$d" 0 10 $(get first_extent_sector "$d")
 done
 
 # rhbz 1064592

test/shell/lvcreate-raid-nosync.sh

@@ -21,7 +21,7 @@ aux prepare_vg 6
 
 # Delay 1st leg so that rebuilding status characters
 #  can be read before resync finished too quick.
-aux delay_dev "$dev1" 0 1
+aux delay_dev "$dev1" 0 10 $(get first_extent_sector "$dev1")
 
 # raid0/raid0_meta don't support resynchronization
 for r in raid0 raid0_meta