The initrd takes care of starting the luks volumes and activing the
dmcrypt udev rules. The udev rule required a modification to deal
with volumes that had already been started, else the cold plug event
that runs at user space startup puts the dmcrypt device into a state
that systemd cannot manage it.
[ Issue: LINUXEXEC-2450 ]
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>