Refining the structure for optimal image build

[YufengXin]

Mert, please create more detailed issues for Cong to implement and review.

Per you message and branches:

I had suggested some changes for the directory structure of the repos. Although it's not directly my territory, but I realized that directory structures may have importance when building docker containers (for actions like copying files, mounting volumes). Also, following best practices for containerized applications, standardization etc can be counted, but my primary topic at the all hands meeting was about deployment.

I made some changes on the directory structures of the repos as an initial work to show what I meant this morning.
https://github.com/mcevik0/sdx-lc/tree/validation
https://github.com/mcevik0/kytos-sdx-topology/tree/luisdev
https://github.com/mcevik0/sdx-controller/tree/luisdev