Diskimage-builder passes the localization environment variables
through to the image being built. Ansible is explicitly setting
"en_US.UTF-8" by default. Depending on the DIB build underway,
and the base image, programs executing in that environment
may fail to execute if localization is not present in the base
image.
As such, we will override the settings for the DIB step.
Closes-Bug: #1563338
Change-Id: I05f0eeb71d3c227b2d8ece52c603c8cfe480c46c
a4e9b4c460