def provision(parameters, resource_group_name, manager_name, custom_headers:nil)
      response = provision_async(parameters, resource_group_name, manager_name, custom_headers:custom_headers).value!
      nil
    end
def provision(parameters, resource_group_name, manager_name, custom_headers:nil)
      response = provision_async(parameters, resource_group_name, manager_name, custom_headers:custom_headers).value!
      nil
    end
Provisions cloud appliance.

 @param parameters [CloudAppliance] The cloud appliance
 @param resource_group_name [String] The resource group name
 @param manager_name [String] The manager name
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.