Add the script used to deprecate sys.path hacks

sys_path_hacks/un_sys_path.sh

@@ -0,0 +1,17 @@
+#! /bin/sh
+export TARGET=$1
+for path in $(find ${TARGET}/djangoapps/ -name '*.py' | grep -v migrations); do
+    export new_path=$(echo $path | sed "s#${TARGET}/djangoapps/#sys_path_hacks/${TARGET}/#")
+    export python_path=$(echo $path | sed "s#/#.#g" | sed "s#.py##" | sed "s#.__init__##")
+    export old_python_path=$(echo $python_path | sed "s#${TARGET}.djangoapps.##")
+    mkdir -p $(dirname $new_path)
+    echo > $new_path <<SCRIPT
+import warnings
+import textwrap
+warnings.warn(textwrap.dedent("""\
+    Importing $old_python_path instead of $python_path is deprecated. See https://github.com/edx/edx-platform/blob/master/docs/decisions/0007-sys-path-modification-removal.rst.
+""", stacklevel=2)
+
+from $python_path import *
+SCRIPT
+done