mount overlayfs command in lxc-test-unpriv is missing a workdir assignment

[Po-Hsu Lin]

While running the lxc-test-unpriv test, it will complain about:

$ sudo /usr/bin/lxc-test-unpriv
mount: wrong fs type, bad option, bad superblock on none,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

Check the dmesg output it will tell you that the mount option needs a workdir assignment as well:
$ dmesg
[89761.978272] overlayfs: missing 'workdir'

This error does not affect the test result, but good to be fixed.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lxc-tests 2.0.8-0ubuntu1~16.04.2
ProcVersionSignature: User Name 4.4.0-98.121-generic 4.4.90
Uname: Linux 4.4.0-98-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Wed Nov 8 08:50:31 2017
KernLog:

ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lxc
UpgradeStatus: No upgrade log present (probably fresh install)
defaults.conf:
 lxc.network.type = veth
 lxc.network.link = lxcbr0
 lxc.network.flags = up
 lxc.network.hwaddr = 00:16:3e:xx:xx:xx

[Po-Hsu Lin (cypressyew)]

Pull request:
https://github.com/lxc/lxc/pull/1908

[Po-Hsu Lin (cypressyew)]

Patch merged.