We need raise fs.aio-max-nr to larger value since Seastar may allocates
more then 65535 AIO events (= kernel default value)
Fixes #3842
Signed-off-by: Takuya ASADA <syuu@scylladb.com>
Message-Id: <20181023030449.15445-1-syuu@scylladb.com>
(cherry picked from commit 950dbdb466)