High: nfsserver: Keep statd directories synced with ha backup

This reduces the complexity of the statd/sm and statd/sm.ha directories.
Right before shutdown we sync statd/sm with statd/sm.ha so client statd
info will failover with the server. This prevents us from having to manage
the third backup folder, statd/sm.ha.save.

This also fixes an issue where stale file handlers are encountered
on the client side after nfsserver failover. Now we always postpone
sending lock reclaim notifications until after both the locking
daemons and nfsd are up.