Introduce .kind on server to support StateMachine

Automation Engine needs to know how a specific PhysicalServer
is managed. It performs AE routing based on this parameter
to support for different approach to be taken for each kind
(e.g. redfish vs xclarity).

Signed-off-by: Miha Pleško <miha.plesko@xlab.si>

app/models/physical_server.rb

@@ -110,4 +110,8 @@ def v_availability
   def v_host_os
     host.try(:vmm_product).nil? ? N_("") : host.vmm_product
   end
+
+  def kind
+    'generic'  # what kind of protocol is used to manage this server e.g. "redfish", "xclarity"
+  end
 end