(Fix) configure CI with using poa-test-setup

[vbaranov]

Problem: the only way to check how Voting DApp works visually with new changes is to run manually poa-test-setup scripts with branch from PR Solution: let's configure Travis CI or Circle CI which will run poa-test-setup at branch with changes on every new PR and it will run a minimal e2e test case:

• creation of a new ballot to add new validator.
• voting to add
• finalize ballot