patch Mode
  Parameters
Specifies the mode of VM Guest Patching to IaaS virtual machine or virtual machines associated to virtual machine scale set with OrchestrationMode as Flexible.
 Possible values are:
 Manual - You  control the application of patches to a virtual machine. You do this by applying patches manually inside the VM. In this mode, automatic updates are disabled; the property WindowsConfiguration.enableAutomaticUpdates must be false
 AutomaticByOS - The virtual machine will automatically be updated by the OS. The property WindowsConfiguration.enableAutomaticUpdates must be true. 
 AutomaticByPlatform - the virtual machine will automatically updated by the platform. The properties provisionVMAgent and WindowsConfiguration.enableAutomaticUpdates must be true