Having worked around the tun00 issue, here's the log from my QNAP server trying to run things. It seems to come up, and every once in a while even gets a connection, then the openvpn crashes/bails for some reason, and we get into about a 30 second restart loop.
In this case, it's running as UID and GID 0, as I thought it might have been a permission thing, but the results are the same using the correct UID/GID for my user.
Don't know if it matters, but the docker version is 1.11.2.
I've also attached the script I'm using to create the container, in case that is helpful. I've backed off strict-port-forward and privoxy in the hope they were the issue, but without a change. Also, note that this script removes the username and password arguments. I just deleted the lines, rather than change them, but rest assured they're there on the version I'm running.
supervisord.log
deluge.sh