dist/common/scripts/scylla_setup: warn twice before constructing RAID volume
dist/common/scripts/scylla_setup: warn twice before constructing RAID volume

Since RAID construction has possibility to destroy user data, warn twice before
executing scylla_raid_setup.

Fixes #1346

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <1487891797-13109-1-git-send-email-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

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