Remove \r chars from dhcp-all-interfaces

For some reason we are adding CR's to/etc/network/interfaces, but it
does not require them. They are a bit annoying to see in an editor and
serve no known purpose there.

Change-Id: I9aeeff5533f418f09fcf33edd42e5d85cd486d23

elements/dhcp-all-interfaces/install.d/generate-interfaces-file.sh

@@ -35,7 +35,7 @@ for interface in $(ls /sys/class/net | grep -v ^lo$) ; do
       TRIES=$(( TRIES - 1 ))
     done
     if [ "$HAS_LINK" == "1" ] ; then
-      printf "auto $interface\r\niface $interface inet dhcp\r\n\r\n" >>$INTERFACES_FILE
+      printf "auto $interface\niface $interface inet dhcp\n\n" >>$INTERFACES_FILE
       echo "Configured"
     else
       echo "No link detected, skipping"