Remove remove_unused_kernels option

The deprecated config option ``remove_unused_kernels`` has been removed
from the ``[libvirt]`` config section. No replacement is required,
as this behaviour is no longer relevant.

Change-Id: I6582cf3c3f1dab1929541d651ce00cef9bef0fbc

manifests/compute/libvirt.pp

@@ -104,16 +104,6 @@
 #   you actually want to deploy.
 #   Defaults to true for backward compatibility.
 #
-# DEPRECATED
-#
-# [*remove_unused_kernels*]
-#   (optional) DEPRECATED. Should unused kernel images be removed?
-#   This is only safe to enable if all compute nodes
-#   have been updated to support this option.
-#   If undef is specified, remove the line in nova.conf
-#   otherwise, use a boolean to remove or not the kernels.
-#   Defaults to undef
-#
 class nova::compute::libvirt (
   $ensure_package                             = 'present',
   $libvirt_virt_type                          = 'kvm',
@@ -134,8 +124,6 @@ class nova::compute::libvirt (
   $virtlog_service_name                       = $::nova::params::virtlog_service_name,
   $compute_driver                             = 'libvirt.LibvirtDriver',
   $manage_libvirt_services                    = true,
-  # Deprecated
-  $remove_unused_kernels                      = undef,
 ) inherits nova::params {
 
   include ::nova::deps
@@ -229,10 +217,6 @@ class nova::compute::libvirt (
     }
   }
 
-  if $remove_unused_kernels {
-    warning('remove_unused_kernels parameter is deprecated, has no effect and will be removed in a future release.')
-  }
-
   if $remove_unused_resized_minimum_age_seconds != undef {
     nova_config {
       'libvirt/remove_unused_resized_minimum_age_seconds': value => $remove_unused_resized_minimum_age_seconds;

releasenotes/notes/remove_unused_kernels_option-1328af2a6938e712.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - The deprecated config option ``remove_unused_kernels`` has been removed from the
+    ``[libvirt]`` config section. No replacement is required, as this behaviour
+    is no longer relevant.