Fix for new resource properties and RBAC assignment

Objects returned from Get-AzureRmResource no longer have a SubscriptionId property and so the rbac scope was being built improperly.

Registration/RegisterWithAzure.psm1

@@ -1206,7 +1206,7 @@ function New-RBACAssignment{
                 Log-Output "Setting $RoleName role on '$($RegistrationResource.ResourceId)'"
     
                 # Determine if RBAC role has been assigned
-                $roleAssignmentScope = "/subscriptions/$($RegistrationResource.SubscriptionId)/resourceGroups/$($RegistrationResource.ResourceGroupName)/providers/Microsoft.AzureStack/registrations/$($RegistrationResource.ResourceName)"
+                $roleAssignmentScope = "/subscriptions/$SubscriptionId/resourceGroups/$($RegistrationResource.ResourceGroupName)/providers/Microsoft.AzureStack/registrations/$($RegistrationResource.ResourceName)"
                 $roleAssignments = Get-AzureRmRoleAssignment -Scope $roleAssignmentScope -ObjectId $ServicePrincipal.ObjectId
     
                 foreach ($role in $roleAssignments)