Revert "Remove parameter nova::compute::pci_passthrough"

This should never have been merged.
It removed more than the deprecated param, breaking the pci config on
computes.
Also should have warned for at least 1 cycle before removal.
It also wasn't removed correctly as the pick remained in nova::compute::pci
so (IIUC) the deprecated param still works today if set in hieradata.

This reverts commit d845b6f0ae.

Change-Id: I5b3d9dbbd41d060134444609458b3e8bba606ae6
(cherry picked from commit e7f323a1f4)

manifests/compute.pp

@@ -290,6 +290,14 @@
 #   this should be set in the api.pp class instead.
 #   Defaults to undef
 #
+# [*pci_passthrough*]
+#   DEPRECATED. Use nova::compute::pci::passthrough instead.
+#   (optional) Pci passthrough list of hash.
+#   Defaults to undef
+#   Example of format:
+#   [ { "vendor_id" => "1234","product_id" => "5678" },
+#     { "vendor_id" => "4321","product_id" => "8765", "physical_network" => "default" } ]
+#
 class nova::compute (
   $enabled                                     = true,
   $manage_service                              = true,
@@ -347,6 +355,7 @@ class nova::compute (
   $install_bridge_utils                        = undef,
   $vcpu_pin_set                                = undef,
   $allow_resize_to_same_host                   = undef,
+  $pci_passthrough                             = undef,
 ) {
 
   include nova::deps
@@ -361,6 +370,12 @@ class nova::compute (
     $max_concurrent_builds)
 
   include nova::pci
+  if $pci_passthrough {
+    # Note: also remove the pick from nova::compute::pci
+    warning('The pci_passthrough parameter is deprecated and will be removed in X. Please use nova::compute::pci::passthrough instead.')
+  }
+  include nova::compute::pci
+
   include nova::compute::vgpu
 
   if $neutron_enabled {

spec/classes/nova_compute_spec.rb

@@ -85,6 +85,11 @@ describe 'nova::compute' do
         is_expected.to contain_package('genisoimage').that_requires('Anchor[nova::install::begin]')
         is_expected.to contain_package('genisoimage').that_comes_before('Anchor[nova::install::end]')
       end
+
+      it 'configures nova pci_passthrough_whitelist' do
+        is_expected.to contain_class('nova::compute::pci')
+        is_expected.to contain_nova_config('pci/passthrough_whitelist').with(:value => '<SERVICE DEFAULT>')
+      end
     end
 
     context 'with overridden parameters' do
@@ -211,6 +216,56 @@ describe 'nova::compute' do
       end
     end
 
+    context 'with pci params array' do
+      let :params do
+        {
+          :pci_passthrough => [
+            {
+              "vendor_id"  => "8086",
+              "product_id" => "0126"
+            },
+            {
+              "vendor_id"        => "9096",
+              "product_id"       => "1520",
+              "physical_network" => "physnet1"
+            }
+          ],
+        }
+      end
+
+      it 'configures nova pci_passthrough_whitelist entries' do
+        is_expected.to contain_class('nova::compute::pci')
+        is_expected.to contain_nova_config('pci/passthrough_whitelist').with(
+          'value' => ['{"vendor_id":"8086","product_id":"0126"}','{"vendor_id":"9096","product_id":"1520","physical_network":"physnet1"}']
+        )
+      end
+    end
+
+    context 'with pci params JSON encoded string (deprecated)' do
+      let :params do
+        {
+          :pci_passthrough => "[{\"vendor_id\":\"8086\",\"product_id\":\"0126\"},{\"vendor_id\":\"9096\",\"product_id\":\"1520\",\"physical_network\":\"physnet1\"}]",
+        }
+      end
+
+      it 'configures nova pci_passthrough_whitelist entries' do
+        is_expected.to contain_class('nova::compute::pci')
+        is_expected.to contain_nova_config('pci/passthrough_whitelist').with(
+          'value' => ['{"vendor_id":"8086","product_id":"0126"}','{"vendor_id":"9096","product_id":"1520","physical_network":"physnet1"}']
+        )
+      end
+    end
+
+    context 'when vcpu_pin_set and pci params are empty' do
+      let :params do
+        { :pci_passthrough => ""}
+      end
+      it 'clears pci_passthrough configuration' do
+        is_expected.to contain_class('nova::compute::pci')
+        is_expected.to contain_nova_config('pci/passthrough_whitelist').with(:value => '<SERVICE DEFAULT>')
+      end
+    end
+
     context 'with reserved_huge_pages array' do
       let :params do
         {