Fix tests

Setting the log file name to a random value in smoke tests
doesn't work because the logger context has already been initialized.

spring-boot-samples/spring-boot-sample-actuator/src/test/java/sample/actuator/EndpointsPropertiesSampleActuatorApplicationTests.java

@@ -66,13 +66,6 @@ public class EndpointsPropertiesSampleActuatorApplicationTests {
 		assertThat(entity.getBody()).contains("\"hello\":\"world\"");
 	}
 
-	@Test
-	public void logfileWithRandomName() {
-		ResponseEntity<String> entity = this.restTemplate.withBasicAuth("user", getPassword())
-				.getForEntity("/admin/logfile", String.class);
-		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
-	}
-
 	private String getPassword() {
 		return "password";
 	}

spring-boot-samples/spring-boot-sample-actuator/src/test/resources/application-endpoints.properties

@@ -1,5 +1,3 @@
-server.error.path: /oops
-management.endpoint.health.show-details: always
-management.endpoints.web.base-path: /admin
-logging.file=./target/${spring.application.instance_id}.log
-spring.application.instance_id=${random.value}
+server.error.path:/oops
+management.endpoint.health.show-details:always
+management.endpoints.web.base-path:/admin