High: nfsserver: let systemd service files handle lock notifications
Low: nfsserver: make sure sm-notify can always execute

If a nfsserver restarts on a node without rebooting, the lock
notifications are not sent out properly because of a stale
sm-notify.pid file. In normal non-ha operation, this is to prevent
sm-notify from notifying clients multiple times, but in an ha
environment we need this to occur.