public HostRoleStatus getDisplayStatus() {
    return displayStatus;
  }
Get the calculated display status. The display_status field is used as
a hint for UI. It's effective only on UpgradeGroup level.
We should expose it for the following states:
SKIPPED_FAILED
FAILED

@return the display status
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/CalculatedStatus.java