Add constructor that takes RestTemplate (#5090)

Author: markpollack

spring-cloud-dataflow-rest-client/src/main/java/org/springframework/cloud/dataflow/rest/client/config/DataFlowClientAutoConfiguration.java

@@ -78,7 +78,6 @@ public class DataFlowClientAutoConfiguration {
 	@Autowired
 	private DataFlowClientProperties properties;
 
-	@Autowired(required = false)
 	private RestTemplate restTemplate;
 
 	@Autowired
@@ -90,6 +89,10 @@ public class DataFlowClientAutoConfiguration {
 	@Autowired
 	private @Nullable OAuth2ClientProperties oauth2ClientProperties;
 
+	public DataFlowClientAutoConfiguration(@Nullable RestTemplate restTemplate) {
+		this.restTemplate = restTemplate;
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(DataFlowOperations.class)
 	public DataFlowOperations dataFlowOperations() throws Exception{