Some bits of the serial-getty@.service.m4 didn't get merged
correctly.  Fix that.

udev: ignore block devices which no known contents, to avoid trying of mounts/swapons when devices aren't set up full yet

Make sure that when a .socket unit is installed without its matching
.service we don't end up activating a legacy SysV/LSB service with the
same name. SysV/LSB style services do not support passing sockets and we
don't want to extend SysV/LSB to ensure we don't break compatibility
with other systems.

shutdown: execute all binaries in /lib/systemd/system-shutdown as last step before invoking reboot()

util: properly resolve /dev/console if more than once console= argument was passed on the kernel command line

https://bugzilla.redhat.com/show_bug.cgi?id=676885

This is useful to exclude root from the session logout killings or to
limit killing to the selinux guest users.