`/etc/local.d/public-keys.start` fixed for systemd

public-keys.start.sh

max_tries=10
i=0
while ((i < max_tries)); do
    wget -q -r --retry-connrefused --tries=10 --timeout=60 -O /tmp/my-key http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key
    if (($? == 0)); then
        break
    fi
    ((i++))
done

if ((i >= max_tries)); then
    exit 1
fi

[ ! -e /home/ec2-user ] && cp -r /etc/skel /home/ec2-user && chown -R ec2-user /home/ec2-user && chgrp -R ec2-user /home/ec2-user
if ! [ -d /home/ec2-user/.ssh ]; then
    mkdir -p /home/ec2-user/.ssh
    chmod 700 /home/ec2-user/.ssh
    chown ec2-user /home/ec2-user/.ssh
    chgrp ec2-user /home/ec2-user/.ssh
fi
cat /tmp/my-key > /home/ec2-user/.ssh/authorized_keys
chmod 600 /home/ec2-user/.ssh/authorized_keys
chown ec2-user /home/ec2-user/.ssh/authorized_keys
chgrp ec2-user /home/ec2-user/.ssh/authorized_keys
rm /tmp/my-key