ospf: support for opaque message

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ospf: fix bug in encoding

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ospf: add segment routing opaque types

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ospf: describe prefix in one attribute 'prefix' for ease of use

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Ryu 3.11

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
bgp: fix send_notificaiton crash

self._localname() is invalid before a connection establishes.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
pip-requires: gui_topology requires webob>=1.2

gui_topology imports webob.static.DirecoryApp
which was added since webob 1.2

Signed-off-by: Hisaharu Ishii <ishii.hisaharu@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
bgp: support specifying nexthop per prefix

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
add --pid-file option to cli

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