When /etc/systemd/system/scylla-server.service.d/capabilities.conf is
not installed, we don't have /etc/systemd/system/scylla-server.service.d/,
need to create it.
Fixes#3738
Signed-off-by: Takuya ASADA <syuu@scylladb.com>
Message-Id: <20180904015841.18433-1-syuu@scylladb.com>