Start HA CLI interactively (#138)

Use -o (--open-tty) to start the child with stdin as /dev/tty to allow
interactive mode. This is required by some commands like the new device
wipe command added with home-assistant/cli#464.

rootfs/usr/bin/cli.sh

@@ -19,6 +19,6 @@ while true; do
         COMMAND=$(echo "$COMMAND" | cut -b 3-)
     fi
 
-    echo "$COMMAND" | xargs ha
+    echo "$COMMAND" | xargs -o ha
     echo ""
 done