sfdisk: make non-interactive output more readable

sfdisk: make non-interactive output more readable

 # echo -e ',1M\n,2M' | sfdisk /dev/sdc

Old version:

  >>> Created a new DOS disklabel with disk identifier 0x8fc7d065.
  Created a new partition 1 of type 'Linux' and of size 1 MiB.
  /dev/sdc2: Created a new partition 2 of type 'Linux' and of size 2 MiB.
  /dev/sdc3:

New version:

  >>> Created a new DOS disklabel with disk identifier 0x9afe17c0.
 /dev/sdc1: Created a new partition 1 of type 'Linux' and of size 1 MiB.
 /dev/sdc2: Created a new partition 2 of type 'Linux' and of size 2 MiB.
 /dev/sdc3: Done.

Addresses: https://github.com/karelzak/util-linux/issues/337
Signed-off-by: Karel Zak <kzak@redhat.com>