remove validate_reset that just returns false

by the time this was added, the buttons looked at supports.
there was a bug in HostFeatureButtonWithDisable
and instead of having that button support both availability mixin and supports feature mixin
this method was added.

this commit only works because we're changing the buttons to only call supports?

refs:

remove validate_reset: ManageIQ#11625
added back: ManageIQ#12324
(guessing we should have changed the button instead)
changes to availability mixin in generic button: manageiq-ui-classic a85cfb1

app/models/host.rb

@@ -323,10 +323,6 @@ def validate_check_compliance_queue
     {:available => true, :message => nil}
   end
 
-  def validate_reset
-    validate_unsupported("Reset is unavailable")
-  end
-
   def validate_unsupported(message_prefix)
     {:available => false, :message => "#{message_prefix} is not available for #{self.class.model_suffix} Host."}
   end