XD-2035 Exclude HealthIndicatorAutoConfiguration

- This will enable only vanilla health indicator to
be available for health endpoint
XD-2030 Fix job instances/step GET endpoints

 - Set producible media type for job instances/step GET
endpoints
  - /jobs/instances/{instanceId}
  - /jobs/instances?jobname={jobName}
  - /jobs/executions/{jobExecutionId}/steps
Update description of how to override rabbit settings in modules.yml

- sync ./spring-xd-yarn/site/config/modules.yml and ./config/modules/modules.yml
XD-2037 Log config locations

- Log XD server/modules config location and name

XD-2037 - rename message logged
Fixed typos in modules.yml
XD-1991 removed FATAL setting from log4j.properties