* debian/initramfs/hook: Added following code (invoked on update-initramfs) (LP: #617725): - create a mdadm.conf if it is not found in /etc and copy it in initramfs - update an existing mdadm.conf in the initramfs if it does'nt include a definition of any array - warn the user if the definition of an active array is not found in the initramfs/etc/mdadm.conf