ws_topology: Avoid controller name confliction

Signed-off-by: YAMADA Hideki <yamada.hideki@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ws_topology: Handle WebSocket disconnection

Signed-off-by: YAMADA Hideki <yamada.hideki@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Add GUI app

Signed-off-by: YAMADA Hideki <yamada.hideki@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
bgp: support IPv6 peering

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>