Description of problem:
With the update to mdadm-3.3, the rules files have changed. dracut needs to
be adapted to match:

[root@noisybay ~]# dracut -f
sed: can't read /var/tmp/initramfs.KHxOmV/usr/lib/udev/rules.d/64-md-raid.rules: No such file or directory
[root@noisybay ~]# rpm -ql mdadm|grep md-raid.rules
[root@noisybay ~]# rpm -ql mdadm|grep rules
/usr/lib/udev/rules.d/63-md-raid-arrays.rules
/usr/lib/udev/rules.d/64-md-raid-assembly.rules
/usr/lib/udev/rules.d/65-md-incremental.rules

This is with

http://kojipkgs.fedoraproject.org//packages/mdadm/3.3/1.fc20/x86_64/mdadm-3.3-1.fc20.x86_64.rpm