Provide a single Docker image to run full backend for local testing

[yurishkuro]

Desired workflow:

1. start docker image
2. run hotrod
3. see traces in the UI

Action items:

• Dockerfile for a single image running all backend and UI
  • Consolidate all default ports into a single range
• Add integration tests that validate the docker image is actually operational
  • curl the query service with debug flag, it should create a trace
  • curl it again looking for that trace by correlation ID
  • curl UI endpoint for trace HTML and maybe do a dumb string search for the correlation ID
• Publish the image to DockerHub

[yurishkuro]

@black-adder just tried to download the all-in-one, and it contains several layers 50Mb+ each. It would be good to pick a slimmer base image. We don't need the full Go toolchain in it.