Bug#571438: Does not set up root device on boot

[anomie at users.sourceforge.net]

Looking into this bug again, it seems that it's the same problem as
https://bugzilla.redhat.com/show_bug.cgi?id=1011704. udev apparently
needs OPTIONS+="db_persist" set at some point in the initrd or it throws
away the necessary information.

I've made this change locally (adding the attached file to
/etc/udev/rules.d/69-local-dm-persist.rules, plus a hook to
/etc/initramfs-tools/hooks/ so it gets copied to the initrd) and my root
device has the correct properties now.
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# Apparently this is needed or udev breaks the initfs

SUBSYSTEM!="block", GOTO="dm_end"
KERNEL!="dm-[0-9]*", GOTO="dm_end"
ACTION!="add|change", GOTO="dm_end"

OPTIONS+="db_persist"

LABEL="dm_end"