Bugfixes:
+* killing nspawn with ]]] results in:
+ machine-f20.scope stopping timed out. Killing.
+ Stopped Container f20.
+ Unit machine-f20.scope entered failed state.
+ and it cannot be started again
+
* enabling an instance unit creates a pointless link, and
the unit will be started with getty@getty.service:
$ systemctl enable getty@.service