XD-1622: Added the display of the batch step type to the UI
* Added code to pull step type out of the StepExecution's
 ExecutionContext.
* Added code to pass type to UI.
* Updated Spring Batch version to the current snapshot to use updates
 made in batch to support this feature.
XD-1311 XD-1767 JobExecution deployed/deleted status

- Add `deployed` and `deleted` status to JobExecutionInfoResource
- At BatchJobExecutionsController:
  - If the job name exists in the `JobDefinitionRepository` but not at the
`JobLocator` then we would set the jobExecution deployed status to `false`
  - If the job name doesn't exist in the `JobDefinitionRepository` at all,
then we would set the deployed/deleted status to `false`
- At the web UI:
  - Add the label to denote the deployed/deleted status at the
JobExecutions list page
- Fix tests

Add job existence status

Call setter methods from controllers

- Set `Deployed` and `Deleted` status based on the conditions rather than depending on the default value
at the `JobExecutionInfoResource`

Add Javadoc

Modify logic to call the setter methods

Fix BatchJobExecutionsControllerIntegrationTests

- Make jobLocator to return empty list so that all the jobs in test are
considered to be `undeployed`.
XD-1477 Merge Container & ContainerAttributes

- Rename `ContainerAttributesRepository` with `ContainerRepository`
  - Also, `ZooKeeperContainerAttributesRepository` to `ZooKeeperContainerRepository`
- Remove existing `ContainerRepository` that returns the containers iterator
  - Use the newly added ContainerRepository as the dependency instead.
- Compose `ContainerRepository` into `DeploymentSupervisor`
  - Update all the dependent listeners to use this container repository
- Move ContainerAttributes into Container
- Create `ContainerResource` REST domain resource that holds ContainerAttributes
- Update Runtime container command operations
- Fix tests