a script to normalize json

this will be used to normalize *.json files in the tree
so that we can get more readable diffs.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
normalize json files using tools/normalize_json.py

i used to use json_pp for this purpose but different versions of perl
seem to format differently.
use python "json.dumps(d, ensure_ascii=True, indent=3, sort_keys=True)"
instead this time.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ofproto_v1_3_parser: add docstring to OFPMatch

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>