ofctl_v1_5 can't send role request messages,
because of lack of arguments.
This patch fixes it by adding the argument for short_id.
ofctl_v1_5 sets None to short_id.
It means ofctl_v1_5 uses the default value of short_id.
Signed-off-by: Satoshi Fujimoto <satoshi.fujimoto7@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>