Werk #9322

Fixes an issue updating from 1.3.11 or older where the upload procedure reports a problem that /rw/boot can not be removed because it is not empty.

It may happen that there are files like System.map-3.2.0-4-686-pae, config-3.2.0-4-686-pae and vmlinuz-3.2.0-4-686-pae in the /rw/boot directory when updating an appliance that was using the 32 bit firmware before. These files are now deleted to clean up the /rw/boot directory.

You can workaround this issue by removing the files from /rw/boot manually before updating to e.g. 1.3.14.