refactor dockerfile, go modules with golang v1.14.2; closes #163

[BOPOHA]

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• removed dep-related comands and notes

• added two Dockerfiles (works with Podman, Buildah too)

  • "prod": for clean build, with tests, runnng with non-root user, from scratch container
  • "dev": there is caching for golang deps, without tests, run as root, and result container can be not from scratch, for debug reasons.

• docker-compose file:

  • added shared context-build block, DRY.
  • removed command name jocko in line command: jocko broker... because of we are using the same ENTRYPOINT in docker file.

• small fixes in module paths:

  • "github.com/hashicorp/consul/testutil/retry" -> "github.com/hashicorp/consul/sdk/testutil/retry"

• update go.mod to the lastest version for all transitive deps (exepts github.com/mitchellh/go-testing-interface v1.4.0)

[travisjeffery]

@BOPOHA this looks good tho i don't think we should run the tests in the main dockerfile, maybe create a separate one called Dockerfile-test