Update pathconfigs library

implement CRD support and add unit tests

Add integration test for crd support

address comments

pkg/crds/constants.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package crds read in files for CRD schemas and parse annotations from it
+package crds
+
+// Annotation is to mark a field as annotations.
+// "x-kubernetes-annotation": ""
+const Annotation = "x-kubernetes-annotation"
+
+// LabelSelector is to mark a field as LabelSelector
+// "x-kubernetes-label-selector": ""
+const LabelSelector = "x-kubernetes-label-selector"
+
+// Identity is to mark a field as Identity
+// "x-kubernetes-identity": ""
+const Identity = "x-kubernetes-identity"
+
+// Version marks the type version of an object ref field
+// "x-kubernetes-object-ref-api-version": <apiVersion name>
+const Version = "x-kubernetes-object-ref-api-version"
+
+// Kind marks the type name of an object ref field
+// "x-kubernetes-object-ref-kind": <kind name>
+const Kind = "x-kubernetes-object-ref-kind"
+
+// NameKey marks the field key that refers to an object of an object ref field
+// "x-kubernetes-object-ref-name-key": "name"
+// default is "name"
+const NameKey = "x-kubernetes-object-ref-name-key"