fix incorrect indentation in petstore spec

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultGenerator.java

@@ -114,6 +114,7 @@ public class DefaultGenerator extends AbstractGenerator implements Generator {
             hostBuilder.append(swagger.getHost());
         } else {
             hostBuilder.append("localhost");
+            LOGGER.warn("'host' not defined in the spec. Default to 'localhost'.");
         }
         if (!StringUtils.isEmpty(swagger.getBasePath()) && !swagger.getBasePath().equals("/")) {
             hostBuilder.append(swagger.getBasePath());

modules/swagger-codegen/src/test/resources/2_0/petstore.yaml

@@ -9,7 +9,7 @@ info:
   license:
     name: Apache-2.0
     url: 'http://www.apache.org/licenses/LICENSE-2.0.html'
-    host: petstore.swagger.io
+host: petstore.swagger.io
 basePath: /v2
 tags:
   - name: pet