Fix undefine method delegate
Fix undefine method delegate

Fix for:
```
NoMethodError:
  undefined method `delegate' for Azure::Armrest::ArmrestService:Class
  Did you mean?  deprecate
 ./lib/azure/armrest/armrest_service.rb:63:in `<class:ArmrestService>'
```

djberg96/azure-armrest,ManageIQ/azure-armrest