ofproto/nx_actions: Flake8 Fixes
ofproto/nx_actions: Flake8 Fixes

Signed-off-by: Jason Kölker <68c46a606457643eab92053c1c05574abb26f861@koelker.net>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

fujita/ryu,osrg/ryu,shinpeimuraoka/ryu,pichuang/ryu,gareging/SDN_Framework,zangree/ryu,hisaharu/ryu,gareging/SDN_Framework,fkakuma/ryu,fujita/ryu,fkakuma/ryu,iwaseyusuke/ryu,lagopus/ryu-lagopus-ext,hisaharu/ryu,pichuang/ryu,fkakuma/ryu,lagopus/ryu-lagopus-ext,hisaharu/ryu,osrg/ryu,zangree/ryu,lagopus/ryu-lagopus-ext,shinpeimuraoka/ryu,pichuang/ryu,fujita/ryu,TakeshiTseng/ryu,Tejas-Subramanya/RYU_MEC,fujita/ryu,iwaseyusuke/ryu,iwaseyusuke/ryu,TakeshiTseng/ryu,Tejas-Subramanya/RYU_MEC,fkakuma/ryu,fkakuma/ryu,gareging/SDN_Framework,pichuang/ryu,TakeshiTseng/ryu,TakeshiTseng/ryu,gareging/SDN_Framework,lagopus/ryu-lagopus-ext,zangree/ryu,hisaharu/ryu,iwaseyusuke/ryu,zangree/ryu,osrg/ryu,Tejas-Subramanya/RYU_MEC,fujita/ryu,gareging/SDN_Framework,iwaseyusuke/ryu,lagopus/ryu-lagopus-ext,shinpeimuraoka/ryu,shinpeimuraoka/ryu,Tejas-Subramanya/RYU_MEC,TakeshiTseng/ryu,hisaharu/ryu,zangree/ryu,Tejas-Subramanya/RYU_MEC,osrg/ryu,pichuang/ryu,osrg/ryu,shinpeimuraoka/ryu