Features:
+* The udev blkid built-in should expose a property that reflects
+ whether media was sensed in USB CF/SD card readers. This should then
+ be used to control SYSTEMD_READY=1/0 so that USB card readers aren't
+ picked up by systemd unless they contain a medium. This would mirror
+ the behaviour we already have for CD drives.
+
+* We should remove really old cruft from cdrom_id
+
* nspawn: emulate /dev/kmsg using CUSE and turn off the syslog syscall
with seccomp. That should provide us with a useful log buffer that
systemd can log to during early boot, and disconnect container logs