Add missing private link fields for CDN version 2020-04-15 (Azure#9858)

* Add missing private link fields for CDN version 2020-04-15.

* Fix examples for CDN endpoint get, list, and update in 2020-04-15

* Fix CDN Endpoints_Update example.

Author: fore5fire

specification/cdn/resource-manager/Microsoft.Cdn/stable/2020-04-15/cdn.json

@@ -4227,6 +4227,22 @@
         "enabled": {
           "description": "Origin is enabled for load balancing or not. By default, origin is always enabled.",
           "type": "boolean"
+        },
+        "privateLinkAlias": {
+          "description": "The Alias of the Private Link resource. Populating this optional field indicates that this origin is 'Private'",
+          "type": "string"
+        },
+        "privateLinkResourceId": {
+          "description": "The Resource Id of the Private Link resource. Populating this optional field indicates that this backend is 'Private'",
+          "type": "string"
+        },
+        "privateLinkLocation": {
+          "description": "The location of the Private Link resource. Required only if 'privateLinkResourceId' is populated",
+          "type": "string"
+        },
+        "privateLinkApprovalMessage": {
+          "description": "A custom message to be included in the approval request to connect to the Private Link.",
+          "type": "string"
         }
       },
       "x-ms-azure-resource": true

specification/cdn/resource-manager/Microsoft.Cdn/stable/2020-04-15/examples/Endpoints_Create.json

@@ -86,7 +86,10 @@
               "originHostHeader": "www.someDomain1.net",
               "priority": 1,
               "weight": 50,
-              "enabled": true
+              "enabled": true,
+              "privateLinkResourceId": "/subscriptions/subid/resourcegroups/rg1/providers/Microsoft.Network/privateLinkServices/pls1",
+              "privateLinkLocation": "eastus",
+              "privateLinkApprovalMessage": "Please approve the connection request for this Private Link"
             }
           },
           {
@@ -162,7 +165,10 @@
                 "originHostHeader": "www.someDomain1.net",
                 "priority": 1,
                 "weight": 50,
-                "enabled": true
+                "enabled": true,
+                "privateLinkResourceId": "/subscriptions/subid/resourcegroups/rg1/providers/Microsoft.Network/privateLinkServices/pls1",
+                "privateLinkLocation": "eastus",
+                "privateLinkApprovalMessage": "Please approve the connection request for this Private Link"
               }
             },
             {
@@ -298,7 +304,10 @@
                 "originHostHeader": "www.someDomain1.net",
                 "priority": 1,
                 "weight": 50,
-                "enabled": true
+                "enabled": true,
+                "privateLinkResourceId": "/subscriptions/subid/resourcegroups/rg1/providers/Microsoft.Network/privateLinkServices/pls1",
+                "privateLinkLocation": "eastus",
+                "privateLinkApprovalMessage": "Please approve the connection request for this Private Link"
               }
             },
             {
@@ -434,7 +443,10 @@
                 "originHostHeader": "www.someDomain1.net",
                 "priority": 1,
                 "weight": 50,
-                "enabled": true
+                "enabled": true,
+                "privateLinkResourceId": "/subscriptions/subid/resourcegroups/rg1/providers/Microsoft.Network/privateLinkServices/pls1",
+                "privateLinkLocation": "eastus",
+                "privateLinkApprovalMessage": "Please approve the connection request for this Private Link"
               }
             },
             {

specification/cdn/resource-manager/Microsoft.Cdn/stable/2020-04-15/examples/Endpoints_Get.json

@@ -33,7 +33,10 @@
                 "originHostHeader": "www.someDomain2.net",
                 "priority": 2,
                 "weight": 50,
-                "enabled": true
+                "enabled": true,
+                "privateLinkResourceId": "/subscriptions/subid/resourcegroups/rg1/providers/Microsoft.Network/privateLinkServices/pls1",
+                "privateLinkLocation": "eastus",
+                "privateLinkApprovalMessage": "Please approve the connection request for this Private Link"
               }
             }
           ],

specification/cdn/resource-manager/Microsoft.Cdn/stable/2020-04-15/examples/Endpoints_ListByProfile.json

@@ -34,7 +34,10 @@
                     "originHostHeader": "www.someDomain2.net",
                     "priority": 2,
                     "weight": 50,
-                    "enabled": true
+                    "enabled": true,
+                    "privateLinkResourceId": "/subscriptions/subid/resourcegroups/rg1/providers/Microsoft.Network/privateLinkServices/pls1",
+                    "privateLinkLocation": "eastus",
+                    "privateLinkApprovalMessage": "Please approve the connection request for this Private Link"
                   }
                 }
               ],

specification/cdn/resource-manager/Microsoft.Cdn/stable/2020-04-15/examples/Endpoints_Update.json

@@ -40,7 +40,10 @@
                 "originHostHeader": "www.someDomain2.net",
                 "priority": 2,
                 "weight": 50,
-                "enabled": true
+                "enabled": true,
+                "privateLinkResourceId": "/subscriptions/subid/resourcegroups/rg1/providers/Microsoft.Network/privateLinkServices/pls1",
+                "privateLinkLocation": "eastus",
+                "privateLinkApprovalMessage": "Please approve the connection request for this Private Link"
               }
             }
           ],
@@ -101,7 +104,10 @@
                 "originHostHeader": "www.someDomain2.net",
                 "priority": 2,
                 "weight": 50,
-                "enabled": true
+                "enabled": true,
+                "privateLinkResourceId": "/subscriptions/subid/resourcegroups/rg1/providers/Microsoft.Network/privateLinkServices/pls1",
+                "privateLinkLocation": "eastus",
+                "privateLinkApprovalMessage": "Please approve the connection request for this Private Link"
               }
             }
           ],