ofproto/nx_match: pep8

> $ pep8 --version
> 1.4.5
> ryu/ofproto/nx_match.py:743:20: E128 continuation line under-indented for visual indent
>                    ofproto_v1_0.NXM_NX_IPV6_SRC_W])
>                    ^
> ryu/ofproto/nx_match.py:764:20: E128 continuation line under-indented for visual indent
>                    ofproto_v1_0.NXM_NX_IPV6_DST_W])
>                    ^

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
lib/packet/arp.py: add convenience function to create arp for ip

Since ip case is most often used, introduce a convenience
function for that.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ofproto/inet: add VRRP protocol number

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
lib/packet/ipv4: add constants for parse/serialize

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
lib/packet/ipv6: add constants for parse/serialize

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
lib/packet: VRRP packet parser/serializer

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
tests/unit, lib/packet/vrrp: unit test for vrrp packet parser/serializer

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
packet lib: docstring

also, prefix a private method with _.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
g/c a stale reference to find_protocol

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
lib: ip address presentation convert helper methods

Signed-off-by: Can Zhang <can@canx.me>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
of1.0: add nx_match to NXFlowStatsRequest

Signed-off-by: OHMURA Kei <ohmura.kei@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ryu.lib.packet: docstring

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ryu.lib.packet: docstring

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ryu/app/rest_firewall.py: handling of no switch connection

This patch improves operation when there is no switch connection.

Cc: Shivaram Mysore <shivaram.mysore@gmail.com>
Signed-off-by: WATANABE Fumitaka <watanabe.fumitaka@nttcom.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
add a template for ryu.lib.packet class documentation.
ryu.lib.packet: docstring tweaks for better rendering
nx_match: remove an unnecessary import