update azure rest api branch to stackadmin2 (#73)

src/Azs.Subscriptions/readme.md

@@ -51,7 +51,7 @@ In this directory, run AutoRest:
 ``` yaml
 azure: true
 powershell: true
-branch: stackadmin
+branch: stackadmin2
 repo: https://github.com/Azure/azure-rest-api-specs/tree/$(branch)
 metadata:
   authors: Microsoft Corporation

src/readme.azurestack.md

@@ -4,7 +4,7 @@
 ``` yaml
 azure: true
 powershell: true
-branch: master
+branch: stackadmin2
 repo: https://github.com/Azure/azure-rest-api-specs/tree/$(branch)
 metadata:
   authors: Microsoft Corporation