doc: leave out too large samples

To let compilation of the document succeed, this patch leave out
large samples.

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
doc: improve the appearance of the table

I don't want to write a directive of sphinx in scripts, but
I was not able to find other methods.

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
sw test tool: Add support fast-failover of GroupMod

Signed-off-by: Yuichi Ito <ito.yuichi0@gmail.com>
sw test tool: Add default test files (group:ff)

These test files aim to examine 'group action' of FlowMod message.

Signed-off-by: Yuichi Ito <ito.yuichi0@gmail.com>