Add scheduler workers support

The configuration option scheduler/workers was added
in Rocky [1]. This patch adds the nova::scheduler::workers
parameter which can be used to set this new config option.

[1] https://docs.openstack.org/releasenotes/nova/rocky.html

Change-Id: I217444b2c30d62347cd9e25def769e94d12a70fc

manifests/scheduler.pp

@@ -16,6 +16,10 @@
 #   (optional) The state of the scheduler package
 #   Defaults to 'present'
 #
+# [*workers*]
+#   (optional) The amount of scheduler workers.
+#   Defaults to $::os_workers
+#
 # [*scheduler_driver*]
 #   (optional) Default driver to use for the scheduler
 #   Defaults to 'filter_scheduler'
@@ -29,6 +33,7 @@ class nova::scheduler(
   $enabled                          = true,
   $manage_service                   = true,
   $ensure_package                   = 'present',
+  $workers                          = $::os_workers,
   $scheduler_driver                 = 'filter_scheduler',
   $discover_hosts_in_cells_interval = $::os_service_default,
 ) {
@@ -46,6 +51,7 @@ class nova::scheduler(
   }
 
   nova_config {
+    'scheduler/workers':                          value => $workers;
     'scheduler/driver':                           value => $scheduler_driver;
     'scheduler/discover_hosts_in_cells_interval': value => $discover_hosts_in_cells_interval;
   }

releasenotes/notes/scheduler-workers-13c4cdee9f6de5da.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added new parameter nova::scheduler::workers which can be used to set the
+    amount of scheduler workers.

spec/classes/nova_scheduler_spec.rb

@@ -8,7 +8,6 @@ describe 'nova::scheduler' do
 
   shared_examples 'nova-scheduler' do
 
-
     it { is_expected.to contain_package('nova-scheduler').with(
       :name   => platform_params[:scheduler_package_name],
       :ensure => 'present'
@@ -20,6 +19,7 @@ describe 'nova::scheduler' do
       :ensure    => 'running'
     )}
 
+    it { is_expected.to contain_nova_config('scheduler/workers').with_value(4) }
     it { is_expected.to contain_nova_config('scheduler/driver').with_value('filter_scheduler') }
     it { is_expected.to contain_nova_config('scheduler/discover_hosts_in_cells_interval').with_value('<SERVICE DEFAULT>') }
 
@@ -42,6 +42,14 @@ describe 'nova::scheduler' do
       )}
     end
 
+    context 'with workers' do
+      let :params do
+        { :workers => 8 }
+      end
+
+      it { is_expected.to contain_nova_config('scheduler/workers').with_value(8) }
+    end
+
     context 'with scheduler driver' do
       let :params do
         { :scheduler_driver => 'custom driver' }
@@ -89,7 +97,7 @@ describe 'nova::scheduler' do
 
   context 'on Debian platforms' do
     let :facts do
-      @default_facts.merge({ :osfamily => 'Debian' })
+      @default_facts.merge({ :osfamily => 'Debian', :os_workers => 4 })
     end
 
     let :platform_params do
@@ -102,7 +110,7 @@ describe 'nova::scheduler' do
 
   context 'on Redhat platforms' do
     let :facts do
-      @default_facts.merge({ :osfamily => 'RedHat' })
+      @default_facts.merge({ :osfamily => 'RedHat', :os_workers => 4 })
     end
 
     let :platform_params do