This is slightly complicated by the fact that rpc-statd.service (and the
related rpc-statd-notify.service) don't have an [Install] and are not
enabled/disabled separately, but instead are pulled in by nfs-
server.service through an explicit Wants=.

This is perhaps worth a discussion with upstream: If statd isn't
necessary with NFS v4, perhaps some other service (like nfs-mountd?)
could check whether it needs statd and start it if needed? If it's not
(reliably) possible to detect the need for it at runtime, we could also
mimic the current /etc/defaults/ behaviour by dropping the Wants= from
nfs-server.service, and either:

 - add a new ExecStartPre=/bin/sh -c ... which checks the value in the
default file and calls "systemctl --no-block start rpc-statd.service
rpc-statd-notify.service" if enabled

or

 - do an one-time migration to adding nfs-server.wants/ symlinks for
rpc-statd.service and rpc-statd-notify.service iff statd is enabled.
That's much harder to discover than a simple systemctl enable/disable,
though.

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https://bugs.launchpad.net/bugs/1428486

Title:
  Only start rpc.statd if $NEED_STATD

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