Add SkipParentValidation annotation from v1 (Azure#484)

client-runtime/src/main/java/com/microsoft/rest/v2/annotations/SkipParentValidation.java

@@ -0,0 +1,22 @@
+/**
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See License.txt in the project root for
+ * license information.
+ */
+
+package com.microsoft.rest.v2.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation used for notifying the validator to skip
+ * validation for the properties in the parent class.
+ *
+ */
+@Target({ElementType.ANNOTATION_TYPE, ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface SkipParentValidation {
+}