[Hub Generated] Add missing listProducts API to documentation (#19392)

* Add specification for list products

* Add spec to 2016-01-01

Author: sdandu21

specification/azurestack/resource-manager/Microsoft.AzureStack/stable/2016-01-01/Product.json

@@ -150,6 +150,54 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.AzureStack/registrations/{registrationName}/products/{productName}/listProducts": {
+      "post": {
+        "x-ms-examples": {
+          "Returns a list of products.": {
+            "$ref": "examples/Product/ListPost.json"
+          }
+        },
+        "tags": [
+          "Product"
+        ],
+        "description": "Returns a list of products.",
+        "operationId": "Products_ListProducts",
+        "parameters": [
+          {
+            "$ref": "AzureStack.json#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "$ref": "AzureStack.json#/parameters/ResourceGroupNameParameter"
+          },
+          {
+            "$ref": "AzureStack.json#/parameters/RegistrationNameParameter"
+          },
+          {
+            "$ref": "#/parameters/ProductNameParameter"
+          },
+          {
+            "$ref": "#/parameters/DeviceConfigurationParameter"
+          },
+          {
+            "$ref": "AzureStack.json#/parameters/ApiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/ProductList"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "../../../../../common-types/resource-management/v2/types.json#/definitions/ErrorResponse"
+            }
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.AzureStack/registrations/{registrationName}/products/{productName}/getProducts": {
       "post": {
         "x-ms-examples": {

specification/azurestack/resource-manager/Microsoft.AzureStack/stable/2017-06-01/Product.json

@@ -150,6 +150,54 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.AzureStack/registrations/{registrationName}/products/{productName}/listProducts": {
+      "post": {
+        "x-ms-examples": {
+          "Returns a list of products.": {
+            "$ref": "examples/Product/ListPost.json"
+          }
+        },
+        "tags": [
+          "Product"
+        ],
+        "description": "Returns a list of products.",
+        "operationId": "Products_ListProducts",
+        "parameters": [
+          {
+            "$ref": "AzureStack.json#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "$ref": "AzureStack.json#/parameters/ResourceGroupNameParameter"
+          },
+          {
+            "$ref": "AzureStack.json#/parameters/RegistrationNameParameter"
+          },
+          {
+            "$ref": "#/parameters/ProductNameParameter"
+          },
+          {
+            "$ref": "#/parameters/DeviceConfigurationParameter"
+          },
+          {
+            "$ref": "AzureStack.json#/parameters/ApiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/ProductList"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "AzureStack.json#/definitions/ErrorResponse"
+            }
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.AzureStack/registrations/{registrationName}/products/{productName}/getProducts": {
       "post": {
         "x-ms-examples": {