Feature: dependsOn functionality for DockerContainer

What are you trying to do?

Improve TC-python feature parity with TC-java by enabling container to specify dependsOn, which should work similar to how depends_on in docker-compose does - container B that depends on container A won't be started until container A is in running state.

Why should it be done this way?

Control order/behavior for container startup in multi-container scenarios.

Other references:

Include any other relevant reading material about the enhancement.

まず TC-python で DockerContainer を見つけ、その API を TC-java の dependsOn 機能および docker-compose の起動動作と比較します。既存の複数コンテナのテストを見つけ、コンテナ A が running 状態に到達するまでコンテナ B が起動しないことを示すカバレッジを追加します。複数コンテナのシナリオでこの動作が機能すれば完了です。