future-util: make repeat_until_value exception safe
future-util: make repeat_until_value exception safe

Signed-off-by: Paweł Dziepak <e29bb3265626c60caf76d587cabdfcd8b379ef80@scylladb.com>
Message-Id: <1460535294-4265-2-git-send-email-e29bb3265626c60caf76d587cabdfcd8b379ef80@scylladb.com>

syuu1228/seastar,cloudius-systems/seastar,kjniemi/seastar,syuu1228/seastar,dreamsxin/seastar,syuu1228/seastar,dreamsxin/seastar,cloudius-systems/seastar,avikivity/seastar,kjniemi/seastar,avikivity/seastar,kjniemi/seastar,scylladb/seastar,scylladb/seastar,avikivity/seastar,scylladb/seastar,cloudius-systems/seastar,dreamsxin/seastar