Add sssd systemd service file override

sssd is monitored by pmon. But currently the Restart option in its
systemd service file is set to on-failure. This sometimes causes
systemd and pmon to fight to restart the service when it fails. All
processes monitored by pmon should have Restart set to "no".

This change added a systemd override file to set Restart to "no" for
sssd service.

Test Plan:
PASS: Standard system deployment.
PASS: Check sssd Restart option using "systemctl cat sssd", verify
      Restart option is set to "no", as following:

      # /etc/systemd/system/sssd.service.d/sssd-stx-override.conf
      [Service]
      # pmond monitors sssd service
      Restart=no
PASS: Kill sssd process, verify pmon restart it successfully by
      tailing pmon.log, and verify sssd is running by "systemctl
      status sssd" command.

Closes-Bug: 2023421
Signed-off-by: Andy Ning <andy.ning@windriver.com>
Change-Id: I84521caf3745122492afe9ef4a251e42129b29b0

puppet-manifests/src/modules/platform/manifests/sssd.pp

@@ -21,6 +21,23 @@ class platform::sssd::config
   inherits ::platform::sssd::params {
 
   if $::osfamily == 'Debian' {
+    # Generate sssd systemd override file
+    $sssd_override_dir = '/etc/systemd/system/sssd.service.d'
+
+    file { $sssd_override_dir:
+      ensure => 'directory',
+      owner  => 'root',
+      group  => 'root',
+      mode   => '0755',
+    }
+    -> file { "${sssd_override_dir}/sssd-stx-override.conf":
+      content => template('platform/sssd.systemd.override.conf.erb'),
+      owner   => 'root',
+      group   => 'root',
+      mode    => '0644',
+    }
+
+    # Update sssd configuration
     class { 'sssd':
       manage_package       => $manage_package,
       manage_service       => $manage_service,

puppet-manifests/src/modules/platform/templates/sssd.systemd.override.conf.erb

@@ -0,0 +1,3 @@
+[Service]
+# pmond monitors sssd service
+Restart=no