Bugfixes:
+* sort-out libudev's is_initialized logic for:
+ - enumerate devices:
+ - is_initialized is true if a database exists
+ - in-container devices:
+ - is_initialized is always false, because there is no database
+
* enabling an instance unit creates a pointless link, and
the unit will be started with getty@getty.service:
$ systemctl enable getty@.service