Revert "packet lib: igmp: add some constant values"

This reverts commit 98998118d6f51148f9f0005165e99984e97a711a.

My bad. Somehow applied twice.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
rest_router: make pep8 comfortable

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