of13: set default attributes for OFPMeterMod

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
of14: set default attributes for OFPMeterMod

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
pip-requires: sort in alphabetical order

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