unit test: test ryu.cmd.manager

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
of13 OFPTableFeaturesStatsRequest: remove an unused argument

and while i'm here, document arguments.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
of13: add a bunch of ONFERR_ constants from OF Extensions for 1.3.X

EXT-230, 231, 232, 236, 237, 260, 264.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>