docker: update following name changes:

`backend_e2e` now print properly backend logs

docker/backend/scripts/entrypoint.sh

@@ -1,19 +0,0 @@
-#!/bin/sh
-
-eval $(dbus-launch --sh-syntax)
-
-# default, backend is launched in foreground
-if [ $# -eq 0 ]
-then
-	exec sat fg
-fi
-
-# backend is launched with an explicit subcommand
-if [ $1 = fg -o $1 = bg -o $1 = debug -o $1 = stop -o $1 = status ]
-then
-	exec sat "$@"
-fi
-
-# a whole command is specified
-sat bg
-exec "$@"