DeploymentPlan: non dependant apps need 2 steps to update.
DeploymentPlan: Execute non dependent before the dependent steps.
DeploymentPlan: more readable toString
AppMock: log messages
IntegrationHealthCheck: fixed wrong assertion
GroupDeployIntegrationTest: only use the proxy app -> no external dependencies
GroupDeployIntegrationTest: name group and app different
GroupDeployIntegrationTest: use deployment events as far as possible