[Ruby] Add auto-generated rubocop config file (#7637)

* add rubocop to ruby api client

* add new files

* fix ruby generator test case

modules/swagger-codegen/src/test/java/io/swagger/codegen/ruby/RubyClientCodegenTest.java

@@ -55,7 +55,7 @@ public class RubyClientCodegenTest {
         if (file.getName().equals("default_api.rb")) {
           apiFileGenerated = true;
           // Ruby client should set the path unescaped in the api file
-          assertTrue(FileUtils.readFileToString(file, StandardCharsets.UTF_8).contains("local_var_path = \"/foo=bar\""));
+          assertTrue(FileUtils.readFileToString(file, StandardCharsets.UTF_8).contains("local_var_path = '/foo=bar'"));
         }
       }
       if (!apiFileGenerated) {

modules/swagger-codegen/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml

@@ -501,7 +501,7 @@ paths:
       parameters:
         - name: username
           in: path
-          description: 'The name that needs to be fetched. Use user1 for testing. '
+          description: 'The name that needs to be fetched. Use user1 for testing.'
           required: true
           type: string
       responses:

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

@@ -501,7 +501,7 @@ paths:
       parameters:
         - name: username
           in: path
-          description: 'The name that needs to be fetched. Use user1 for testing. '
+          description: 'The name that needs to be fetched. Use user1 for testing.'
           required: true
           type: string
       responses: