Update expected AdmissionReview

--- FAIL: TestCompatibility/admission.k8s.io.v1beta1.AdmissionReview/v1.14.0 (0.02s)
            compatibility.go:460: json differs
            compatibility.go:461:   strings.Join({
                  	... // 31 identical lines
                  	`    "object": {"apiVersion":"example.com/v1","kind":"CustomType","spec":{"replicas":1},"status":{"available":1}},`,
                  	`    "oldObject": {"apiVersion":"example.com/v1","kind":"CustomType","spec":{"replicas":1},"status":{"available":1}},`,
                - 	`    "dryRun": true`,
                + 	`    "dryRun": true,`,
                + 	`    "options": null`,
                  	"  },",
                  	`  "response": {`,
                  	... // 33 identical lines
                  }, "\n")

            compatibility.go:466: yaml differs
            compatibility.go:467:   strings.Join({
                  	... // 23 identical lines
                  	"      available: 1",
                  	"  operation: 祈¡ıŵDz廔ȇ{sŊƏp饏姥呄鐊",
                + 	"  options: null",
                  	"  resource:",
                  	`    group: "5"`,
                  	... // 38 identical lines
                  }, "\n")

            compatibility.go:472: proto differs
            compatibility.go:474:   strings.Join({
                  	... // 37 identical lines
                  	"    }",
                  	"    11: 1",
                + 	`    12: ""`,
                + 	`    15: ""`,
                  	"  }",
                  	"  2 {",
                  	... // 36 identical lines
                  }, "\n")

Null `options` in json and additional proto tag 12 caused by https://github.com/kubernetes/kubernetes/pull/77563#discussion_r282803268

Proto tag 15 caused by https://github.com/kubernetes/kubernetes/pull/78135/files#diff-3bc4acaf71b6b50648da046287017c54R82

staging/src/k8s.io/api/testdata/v1.14.0/admission.k8s.io.v1beta1.AdmissionReview.after_roundtrip.json

@@ -0,0 +1,70 @@
+{
+  "kind": "AdmissionReview",
+  "apiVersion": "admission.k8s.io/v1beta1",
+  "request": {
+    "uid": "ő岅ȕHH壬%龺ǟ橸章蒪ʤǎ",
+    "kind": {
+      "group": "2",
+      "version": "3",
+      "kind": "4"
+    },
+    "resource": {
+      "group": "5",
+      "version": "6",
+      "resource": "7"
+    },
+    "subResource": "8",
+    "name": "9",
+    "namespace": "10",
+    "operation": "祈¡ıŵDz廔ȇ{sŊƏp饏姥呄鐊",
+    "userInfo": {
+      "username": "11",
+      "uid": "12",
+      "groups": [
+        "13"
+      ],
+      "extra": {
+        "14": [
+  "15"
+]
+      }
+    },
+    "object": {"apiVersion":"example.com/v1","kind":"CustomType","spec":{"replicas":1},"status":{"available":1}},
+    "oldObject": {"apiVersion":"example.com/v1","kind":"CustomType","spec":{"replicas":1},"status":{"available":1}},
+    "dryRun": true,
+    "options": null
+  },
+  "response": {
+    "uid": "爟¼ªov鈶",
+    "allowed": false,
+    "status": {
+      "metadata": {
+        "selfLink": "(湗Ć]ʪƬ滈憴Uą飋ī",
+        "resourceVersion": "71208173751669476"
+      },
+      "status": "16",
+      "message": "17",
+      "reason": "Hr鯹)晿\u003co,c鮽ort昍řČ扷5Ɨ",
+      "details": {
+        "name": "18",
+        "group": "19",
+        "kind": "20",
+        "uid": "Ƣ6/ʕVŚ(ĿȊ甞",
+        "causes": [
+          {
+            "reason": "颋Dž",
+            "message": "21",
+            "field": "22"
+          }
+        ],
+        "retryAfterSeconds": 1001983654
+      },
+      "code": 153738858
+    },
+    "patch": "fQ==",
+    "patchType": "-Ǐ忄*齧獚敆Ȏțê",
+    "auditAnnotations": {
+      "23": "24"
+    }
+  }
+}

staging/src/k8s.io/api/testdata/v1.14.0/admission.k8s.io.v1beta1.AdmissionReview.after_roundtrip.yaml

@@ -0,0 +1,65 @@
+apiVersion: admission.k8s.io/v1beta1
+kind: AdmissionReview
+request:
+  dryRun: true
+  kind:
+    group: "2"
+    kind: "4"
+    version: "3"
+  name: "9"
+  namespace: "10"
+  object:
+    apiVersion: example.com/v1
+    kind: CustomType
+    spec:
+      replicas: 1
+    status:
+      available: 1
+  oldObject:
+    apiVersion: example.com/v1
+    kind: CustomType
+    spec:
+      replicas: 1
+    status:
+      available: 1
+  operation: 祈¡ıŵDz廔ȇ{sŊƏp饏姥呄鐊
+  options: null
+  resource:
+    group: "5"
+    resource: "7"
+    version: "6"
+  subResource: "8"
+  uid: ő岅ȕHH壬%龺ǟ橸章蒪ʤǎ
+  userInfo:
+    extra:
+      "14":
+      - "15"
+    groups:
+    - "13"
+    uid: "12"
+    username: "11"
+response:
+  allowed: false
+  auditAnnotations:
+    "23": "24"
+  patch: fQ==
+  patchType: -Ǐ忄*齧獚敆Ȏțê
+  status:
+    code: 153738858
+    details:
+      causes:
+      - field: "22"
+        message: "21"
+        reason: 颋Dž
+      group: "19"
+      kind: "20"
+      name: "18"
+      retryAfterSeconds: 1001983654
+      uid: Ƣ6/ʕVŚ(ĿȊ甞
+    message: "17"
+    metadata:
+      resourceVersion: "71208173751669476"
+      selfLink: (湗Ć]ʪƬ滈憴Uą飋ī
+    reason: Hr鯹)晿<o,c鮽ort昍řČ扷5Ɨ
+    status: "16"
+  uid: 爟¼ªov鈶