front and teas do not register to a2

[imartinezortiz]

There is an issue in the docker-compose that avoids front to register into a2.

front:
  environment:
    - A2_PORT=tcp://a2:3000
...
teas:
  environment:
    - A2_PORT=tcp://a2:3000

to

front:
  environment:
    - A2_PORT=http://a2:3000
...
teas:
  environment:
    - A2_PORT=http://a2:3000

Also makes sense too to verify and modify the rest of URL to use the proper protocol.