test: lower the # of mpath devices to 16

to make the test suitable for slower machines.

(cherry picked from commit 1678bd2f81096b3b2b7c09f335e9c5cc8da96dca)

test/TEST-64-UDEV-STORAGE/test.sh

@@ -287,8 +287,8 @@ EOF
     mkfs.ext4 -U "deadbeef-dead-dead-beef-111111111111" -L "failover_vol" "${lodev}p2"
     losetup -d "$lodev"
 
-    # Add 64 multipath devices, each backed by 4 paths
-    for ndisk in {0..63}; do
+    # Add 16 multipath devices, each backed by 4 paths
+    for ndisk in {0..15}; do
         wwn="0xDEADDEADBEEF$(printf "%.4d" "$ndisk")"
         # Use a partitioned disk for the first device to test failover
         [[ $ndisk -eq 0 ]] && image="$partdisk" || image="${TESTDIR:?}/disk$ndisk.img"

test/units/testsuite-64.sh

@@ -82,7 +82,7 @@ EOF
     udevadm settle
     ls -l /dev/disk/by-id/
 
-    for i in {0..63}; do
+    for i in {0..15}; do
         wwid="deaddeadbeef$(printf "%.4d" "$i")"
         path="/dev/disk/by-id/wwn-0x$wwid"
         dmpath="$(readlink -f "$path")"