running-in-container does not properly report 'lxc' on trusty

[Chad Smith]

Should we expect 'running-in-container' to report 'lxc' to non-root users?

root@t2:~# running-in-container
lxc
root@t2:~# su - ubuntu
ubuntu@t2:~$ running-in-container
ubuntu@t2:~$

ubuntu@t2:~$ cat /run/container_type
lxc
ubuntu@t2:~$ ls -l /run/container_type
-rw-r--r-- 1 root root 4 Apr 7 13:59 /run/container_type

ubuntu@t2:~$ cat /etc/os-release
NAME="Ubuntu"
VERSION="14.04.6 LTS, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04.6 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"