Add deprecation warnings to the mkimage scripts that are have consolidated mkimage implementations

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)

contrib/mkimage-busybox.sh

@@ -2,6 +2,10 @@
 # Generate a very minimal filesystem based on busybox-static,
 # and load it into the local docker under the name "busybox".
 
+echo >&2
+echo >&2 'warning: this script is deprecated - see mkimage.sh and mkimage/busybox-static'
+echo >&2
+
 BUSYBOX=$(which busybox)
 [ "$BUSYBOX" ] || {
     echo "Sorry, I could not locate busybox."

contrib/mkimage-debootstrap.sh

@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
 set -e
 
+echo >&2
+echo >&2 'warning: this script is deprecated - see mkimage.sh and mkimage/debootstrap'
+echo >&2
+
 variant='minbase'
 include='iproute,iputils-ping'
 arch='amd64' # intentionally undocumented for now

contrib/mkimage-rinse.sh

@@ -8,6 +8,10 @@
 
 set -e
 
+echo >&2
+echo >&2 'warning: this script is deprecated - see mkimage.sh and mkimage/rinse'
+echo >&2
+
 repo="$1"
 distro="$2"
 mirror="$3"