Features:
+* rework kexec logic to use new kexec_file_load() syscall, so that we
+ don't have to call kexec tool anymore.
+
* 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