Merge pull request #51 from Azure/201807

[devices]: Fix arista-convertfs for aligning flash via sfdisk in Jess…

Author: Alex-Dai

files/initramfs-tools/arista-convertfs.j2

@@ -172,7 +172,7 @@ umount "$root_mnt"
 if [ $(echo -n "$root_dev" | tail -c 1) == "1" ]; then
     # Create a new partition table (content in flash_dev will be deleted)
     err_msg="Error: repartitioning $flash_dev failed"
-    cmd="echo '2048' | sfdisk $flash_dev || (sleep 3; blockdev --rereadpt $flash_dev && fdisk -l $flash_dev | grep -q ${root_dev}.*Linux)"
+    cmd="echo '2048' | sfdisk -u S --force $flash_dev || (sleep 3; blockdev --rereadpt $flash_dev && fdisk -l $flash_dev | grep -q ${root_dev}.*Linux)"
     run_cmd "$cmd" "$err_msg"
 fi