Use deterministic randomness in ExampleGenerator. (#5068)

* Update samples for nodejs + nodejs-google-cloud-functions.

* Fix example generator to use deterministic randomness.

This avoids changing results after each generation, and makes diff reviews easier.

* Update NodeJS samples.

This is the last "randomness" update. From now on the samples should only change if either the generator, the input or parameters change.

samples/server/petstore/nodejs/api/swagger.yaml

@@ -108,11 +108,11 @@ paths:
         type: "array"
         items:
           type: "string"
-          default: "available"
           enum:
           - "available"
           - "pending"
           - "sold"
+          default: "available"
         collectionFormat: "csv"
       responses:
         200:
@@ -356,8 +356,8 @@ paths:
         description: "ID of pet that needs to be fetched"
         required: true
         type: "integer"
-        maximum: 5.0
-        minimum: 1.0
+        maximum: 5
+        minimum: 1
         format: "int64"
       responses:
         200: