Add 'kubectl edit' testcase for unknown field in known group/version/kind

pkg/kubectl/cmd/testdata/edit/testcase-unknown-field-known-group-kind/0.response

+{
+	"kind": "StorageClass",
+	"apiVersion": "storage.k8s.io/v1beta1",
+	"metadata": {
+		"name": "foo",
+		"selfLink": "/apis/storage.k8s.io/v1beta1/storageclassesfoo",
+		"uid": "b2287558-f190-11e6-b041-acbc32c1ca87",
+		"resourceVersion": "21388",
+		"creationTimestamp": "2017-02-13T02:04:04Z",
+		"labels": {
+			"label1": "value1"
+		}
+	},
+	"provisioner": "foo",
+	"parameters": {
+		"baz": "qux",
+		"foo": "bar"
+	},
+	"unknownServerField1": {
+		"data": true
+	},
+	"unknownServerField2": {
+		"data": true
+	}
+}

pkg/kubectl/cmd/testdata/edit/testcase-unknown-field-known-group-kind/1.edited

+# Please edit the object below. Lines beginning with a '#' will be ignored,
+# and an empty file will abort the edit. If an error occurs while saving this file will be
+# reopened with the relevant failures.
+#
+apiVersion: storage.k8s.io/v1beta1
+kind: StorageClass
+metadata:
+  creationTimestamp: 2017-02-13T02:04:04Z
+  labels:
+    label1: value1
+    label2: value2
+  name: foo
+  resourceVersion: "21388"
+  selfLink: /apis/storage.k8s.io/v1beta1/storageclassesfoo
+  uid: b2287558-f190-11e6-b041-acbc32c1ca87
+parameters:
+  baz: qux
+  foo: bar
+provisioner: foo
+unknownClientField:
+  clientdata: true
+unknownServerField1:
+  data: true

pkg/kubectl/cmd/testdata/edit/testcase-unknown-field-known-group-kind/1.original

+# Please edit the object below. Lines beginning with a '#' will be ignored,
+# and an empty file will abort the edit. If an error occurs while saving this file will be
+# reopened with the relevant failures.
+#
+apiVersion: storage.k8s.io/v1beta1
+kind: StorageClass
+metadata:
+  creationTimestamp: 2017-02-13T02:04:04Z
+  labels:
+    label1: value1
+  name: foo
+  resourceVersion: "21388"
+  selfLink: /apis/storage.k8s.io/v1beta1/storageclassesfoo
+  uid: b2287558-f190-11e6-b041-acbc32c1ca87
+parameters:
+  baz: qux
+  foo: bar
+provisioner: foo
+unknownServerField1:
+  data: true
+unknownServerField2:
+  data: true

pkg/kubectl/cmd/testdata/edit/testcase-unknown-field-known-group-kind/2.request

+{
+	"metadata": {
+		"labels": {
+			"label2": "value2"
+		},
+		"namespace": ""
+	},
+	"unknownClientField": {
+		"clientdata": true
+	},
+	"unknownServerField2": null
+}
\ No newline at end of file

pkg/kubectl/cmd/testdata/edit/testcase-unknown-field-known-group-kind/2.response

+{
+	"kind": "StorageClass",
+	"apiVersion": "storage.k8s.io/v1beta1",
+	"metadata": {
+		"name": "foo",
+		"selfLink": "/apis/storage.k8s.io/v1beta1/storageclassesfoo",
+		"uid": "b2287558-f190-11e6-b041-acbc32c1ca87",
+		"resourceVersion": "21431",
+		"creationTimestamp": "2017-02-13T02:04:04Z",
+		"labels": {
+			"label1": "value1",
+			"label2": "value2"
+		}
+	},
+	"provisioner": "foo",
+	"parameters": {
+		"baz": "qux",
+		"foo": "bar"
+	},
+	"unknownClientField": {
+		"clientdata": true
+	},
+	"unknownServerField1": {
+		"data": true
+	}
+}

pkg/kubectl/cmd/testdata/edit/testcase-unknown-field-known-group-kind/test.yaml

+description: edit an unknown version of a known group/kind
+mode: edit
+args:
+- storageclasses.v1beta1.storage.k8s.io/foo
+namespace: default
+expectedStdout:
+- "storageclass \"foo\" edited"
+expectedExitCode: 0
+steps:
+- type: request
+  expectedMethod: GET
+  expectedPath: /apis/storage.k8s.io/v1beta1/storageclasses/foo
+  expectedInput: 0.request
+  resultingStatusCode: 200
+  resultingOutput: 0.response
+- type: edit
+  expectedInput: 1.original
+  resultingOutput: 1.edited
+- type: request
+  expectedMethod: PATCH
+  expectedPath: /apis/storage.k8s.io/v1beta1/storageclasses/foo
+  expectedContentType: application/strategic-merge-patch+json
+  expectedInput: 2.request
+  resultingStatusCode: 200
+  resultingOutput: 2.response