FIX: ONIE Build Error | Multilib | Locale-gen

[tchandramohan]

Hi,

I created this ticket to serve as a fix to people encountering the same issue.
This issue was previously posted here: #972

When I was building ONIE for a KVM_x86_64 target, the build kept failing.
The commands I used are:
build@f1063a996da6:~/src/onie/build-config$: make MACHINE=kvm_x86_64 all
When this did not work, naturally, I tried to run -> make distclean

The reason why it failed can be seen in the below trace:
In particular, the build fails at the multilib package. After diving into the error, it can be seen that the type for the locale variables inside the container are of the type -> POSIX
You can verify this by running the command -> locale

The fix to this issue lies in editing the Dockerfile before launching the container.

Below, I am attaching two screenshots: One screenshot shows the original dockerfile & the other shows the changes made to it.
The modified dockerfile forcefully sets all environment variables to the format en_US.UTF-8
Use the modified dockerfile to launch the container and log in
(steps described here: https://github.com/opencomputeproject/onie/blob/master/contrib/build-env/README.md)

Original Dockerfile:

Modified Dockerfile (changes to be made indicated with a red rectangle bounding box):