Polish "Added AppBootSchemaVersion tests and updated controller"

- Fixed checkstyles
- Removed AppRegistryCommandTests (add back in next PR)

Author: onobc

spring-cloud-dataflow-shell-core/src/main/java/org/springframework/cloud/dataflow/shell/command/AppRegistryCommands.java

@@ -24,7 +24,6 @@
 import java.util.Properties;
 import java.util.stream.Collectors;
 
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.configurationmetadata.ConfigurationMetadataProperty;
 import org.springframework.cloud.dataflow.core.AppBootSchemaVersion;
 import org.springframework.cloud.dataflow.core.ApplicationType;