Dependency graph initialization does not wait for readychecks about docker-it-scala

[Teots]

I would really appreciate that feature. Right now I try to run 3 containers - zookeeper, kafka and schema-registry, but it's a gamble whether the full setup works or not, because the schema-registry fails on startup, if kafka is not up yet.

[viktortnk]

@mdotson Could you please make a PR. I'd be happy to push it through

[mdotson]

@viktortnk will do, I need to write some tests for it still.
@Teots are you using the confluentinc/cp-* images? Do you have a specific tag you are working with, I'm thinking of using it for the test.

[Teots]

I used cgswong/confluent-schema-registry:2.0.1, the lastest version of confluentinc/cp-schema-registry has a retry mechanism that made my setup working without waiting for the other containers to be ready.

[viktortnk]

released under 0.9.0-RC4