TMPDIR was changed to DOCKER_TMPDIR in pull request 7113 but the file still asks user to set TMPDIR.
I am new to docker and wasted sometime this morning because of this.
I am using docker version 1.12.1 on ubuntu server 14.04
Signed-off-by: Neyazul Haque <nuhaque@gmail.com>
These were found using `git grep -nE '[^-a-zA-Z0-9<>]-[a-zA-Z0-9]{2}'` (fair warning: _many_ false positives there).
Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
