openjdk-8-jre-headless/jessie-backports requires
ca-certificates-java/jessie-backports, but apt doesn't override
ca-certificates-java/jessie by default.
So install it before installing openjdk-8.
Fixes#40
Signed-off-by: Takuya ASADA <syuu@scylladb.com>
Message-Id: <1487269613-21196-1-git-send-email-syuu@scylladb.com>
962a42dbd5