ws_topology: shut up pep8 for long lines in a comment

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

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
sw test tool: Enable IPv6 flow label maskable

OF 1.3.4 spec (B.15.1 Changes) says:

    Make IPv6 flow label maskable (EXT-101).

This patch makes IPv6 flow label maskable, and adds a test file for IPv6 flow label with masks.

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