Remove cells.driver configuration option

The cells.driver configuration option was deprecated and
is now being removed in the Ocata cycle.

Change-Id: I881a5b6c09f4061d73f6007e08515f400ff8e72c

manifests/cells.pp

@@ -132,12 +132,6 @@
 #    It might be used by some cell scheduling code in the future
 #    Defaults to '1.0'
 #
-# DEPRECATED
-#
-#  [*driver*]
-#    Cells communication driver to use
-#    Defaults to undef
-#
 class nova::cells (
   $bandwidth_update_interval     = '600',
   $call_timeout                  = '60',
@@ -166,17 +160,11 @@ class nova::cells (
   $scheduler_weight_classes      = 'nova.cells.weights.all_weighers',
   $weight_offset                 = '1.0',
   $weight_scale                  = '1.0',
-  # Deprecated
-  $driver                        = undef,
 ) {
 
   include ::nova::deps
   include ::nova::params
 
-  if $driver {
-    warning('driver parameter is now deprecated, has no effect and will be removed at Ocata cycle.')
-  }
-
   case $cell_type {
     'parent': {
       nova_config { 'DEFAULT/compute_api_class': value => 'nova.compute.cells_api.ComputeCellsAPI' }

releasenotes/notes/remove_deprecated_cells_driver_option-14a58961ef261528.yaml

@@ -0,0 +1,3 @@
+---
+upgrade:
+  - The 'driver' option in [cells] is removed in Ocata.