Feature/stdin functional tests

[dmbarra]

- What I did
Created a suite of functional tests to validate STDIN commands for Single version

- How I did it
For the functional_test I created the same structure I did before for another test, I create Json to have scenarios and create a file to run this scenario

- How to verify it
Make functional-test-single

[codecov-commenter]

Codecov Report

Merging #126 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #126   +/-   ##
=======================================
  Coverage   43.77%   43.77%           
=======================================
  Files          58       58           
  Lines        2362     2362           
=======================================
  Hits         1034     1034           
  Misses       1150     1150           
  Partials      178      178           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 45822c4...7a13b46. Read the comment docs.