Drop management of dbus service

The dbus service is fundamental in CentOS/RHEL systems and we can
assume the service is always running.

Change-Id: I7775effaed6d7b476131675ee8ccdfd0a99cdff9

manifests/compute/libvirt/services.pp

@@ -148,19 +148,6 @@ class nova::compute::libvirt::services (
       tag    => ['libvirt-service', 'libvirt-qemu-service'],
     }
     Libvirtd_config<||> ~> Service['libvirt']
-
-    # messagebus
-    if( $facts['os']['family'] == 'RedHat') {
-      # NOTE(tkajinam): Do not use libvirt-service tag to avoid unnecessary
-      # restart.
-      service { 'messagebus':
-        ensure  => running,
-        enable  => true,
-        name    => $::nova::params::messagebus_service_name,
-        require => Anchor['nova::service::begin'],
-        before  => Anchor['nova::service::end'],
-      }
-    }
   }
 
   if $virtlock_service_name {
@@ -184,8 +171,6 @@ class nova::compute::libvirt::services (
   }
 
   if ! $modular_libvirt {
-    Service<| title == 'messagebus' |> -> Service<| title == 'libvirt' |>
-
     Service<| title == 'virtlogd' |>
     -> Service<| title == 'libvirt' |>
     -> Service<| title == 'nova-compute'|>
@@ -202,8 +187,6 @@ class nova::compute::libvirt::services (
     # NOTE(tkajinam): libvirt should be stopped before starting modular daemons
     Service<| title == 'libvirt' |> -> Service<| tag == 'libvirt-modular-service' |>
 
-    Service<| title == 'messagebus' |> -> Service<| tag == 'libvirt-modular-service' |>
-
     Service<| title == 'virtlogd' |>
     -> Service<| tag == 'libvirt-modular-service' |>
     -> Service<| title == 'nova-compute'|>

manifests/params.pp

@@ -68,7 +68,6 @@ class nova::params {
       $nova_wsgi_script_path             = '/var/www/cgi-bin/nova'
       $nova_api_wsgi_script_source       = '/usr/bin/nova-api-wsgi'
       $nova_metadata_wsgi_script_source  = '/usr/bin/nova-metadata-wsgi'
-      $messagebus_service_name           = 'dbus'
     }
     'Debian': {
       # package names

spec/classes/nova_compute_libvirt_spec.rb

@@ -255,7 +255,6 @@ describe 'nova::compute::libvirt' do
         it { is_expected.not_to contain_package('libvirt') }
         it { is_expected.not_to contain_service('libvirt') }
         it { is_expected.not_to contain_package('libvirt-nwfilter') }
-        it { is_expected.not_to contain_service('messagebus') }
         it { is_expected.not_to contain_service('virtlockd') }
         it { is_expected.not_to contain_service('virtlogd') }
       end
@@ -285,12 +284,6 @@ describe 'nova::compute::libvirt' do
         :ensure => 'running',
         :before => ['Anchor[nova::service::end]', 'Service[nova-compute]'],
       )}
-      it { is_expected.to contain_service('messagebus').with(
-        :ensure => 'running',
-        :enable => true,
-        :before => ['Anchor[nova::service::end]', 'Service[libvirt]'],
-        :name   => 'dbus'
-      ) }
 
       it { is_expected.to contain_nova_config('DEFAULT/compute_driver').with_value('libvirt.LibvirtDriver')}
       it { is_expected.to contain_nova_config('libvirt/virt_type').with_value('kvm')}
@@ -362,7 +355,6 @@ describe 'nova::compute::libvirt' do
         it { is_expected.not_to contain_package('libvirt') }
         it { is_expected.not_to contain_service('libvirt') }
         it { is_expected.not_to contain_package('libvirt-nwfilter') }
-        it { is_expected.not_to contain_service('messagebus') }
         it { is_expected.not_to contain_service('virtlockd') }
         it { is_expected.not_to contain_service('virtlogd') }
       end