We experienced 'Constructing RAID volume...' takes too much time on some AMIs,
this is because setup script stuck at 'yum -y install mdadm xfsprogs'.
We don't have to install these packages on AMI startup time, we should
preinstall them on AMI creating time.
Signed-off-by: Takuya ASADA <syuu@scylladb.com>
Message-Id: <1502192796-21040-1-git-send-email-syuu@scylladb.com>