Convert shelve operations to use SupportsFeatureMixin

app/models/vm/operations/power.rb

@@ -19,6 +19,8 @@ module Vm::Operations::Power
     end
 
     supports_not :pause
+    supports_not :shelve
+    supports_not :shelve_offload
   end
 
   def vm_powered_on?
@@ -32,12 +34,4 @@ def validate_stop
   def validate_pause
     validate_vm_control_powered_on
   end
-
-  def validate_shelve
-    validate_unsupported("Shelve Operation")
-  end
-
-  def validate_shelve_offload
-    validate_unsupported("Shelve Offload Operation")
-  end
 end

app/models/vm_or_template/operations.rb

@@ -106,22 +106,6 @@ def log_user_event(user_event)
   # UI button validation methods
   #
 
-  def validate_vm_control_shelve_action
-    unless supports_control?
-      return {:available => false, :message => unsupported_reason(:control)}
-    end
-    return {:available => true,   :message => nil}  if %w(on off suspended paused).include?(current_state)
-    {:available => false,  :message => "The VM can't be shelved, current state has to be powered on, off, suspended or paused"}
-  end
-
-  def validate_vm_control_shelve_offload_action
-    unless supports_control?
-      return {:available => false, :message => unsupported_reason(:control)}
-    end
-    return {:available => true,   :message => nil}  if %w(shelved).include?(current_state)
-    {:available => false,  :message => "The VM can't be shelved offload, current state has to be shelved"}
-  end
-
   included do
     supports :control do
       msg = if retired?