Note that now ryu uses /etc/ryu/ryu.conf. The previous install path (/usr/etc/ryu/ryu.conf) doesn't fit to FHS. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>