sw test tool: Add default test files (group:all/select)

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

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

This test file aims to examine 'group action' of FlowMod message.

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