remove erase_filesystem function

It has no users.

Changelog: None

Signed-off-by: Mirza Krak <mirza.krak@northern.tech>

mender-convert-functions.sh

@@ -381,15 +381,6 @@ unmount_partitions() {
   fi
 }
 
-# Takes following arguments:
-#
-#  $1 - raw disk image
-erase_filesystem() {
-  log "Erase filesystem..."
-  sudo wipefs --all --force ${1}?*
-  sudo dd if=/dev/zero of=${1} bs=1M count=100
-}
-
 # Takes following arguments:
 #
 #  $1 - raw disk image path