dist/common/scripts/scylla_raid_setup: prevent renaming MDRAID device after reboot
dist/common/scripts/scylla_raid_setup: prevent renaming MDRAID device after reboot

On Debian variants, mdadm.conf should placed at /etc/mdadm instead of /etc.
Also it seems we need update-initramfs to fix renaming issue.

Fixes #2502

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <1499179912-14125-1-git-send-email-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

duarten/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,avikivity/scylla,avikivity/scylla