tester: Reduce pylint warnings
tester: Reduce pylint warnings

Signed-off-by: IWASE Yusuke <bb80e84cc9f5a8f01385872ee89032beb5d4eba7@gmail.com>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

habibiefaried/ryu,gareging/SDN_Framework,habibiefaried/ryu,ttsubo/ryu,zangree/ryu,takahashiminoru/ryu,alanquillin/ryu,fujita/ryu,hisaharu/ryu,hisaharu/ryu,Tejas-Subramanya/RYU_MEC,pichuang/ryu,gareging/SDN_Framework,alanquillin/ryu,takahashiminoru/ryu,zangree/ryu,osrg/ryu,alanquillin/ryu,ttsubo/ryu,shinpeimuraoka/ryu,gareging/SDN_Framework,osrg/ryu,fujita/ryu,OpenState-SDN/ryu,habibiefaried/ryu,lagopus/ryu-lagopus-ext,TakeshiTseng/ryu,fkakuma/ryu,Zouyiran/ryu,zangree/ryu,lagopus/ryu-lagopus-ext,hisaharu/ryu,fkakuma/ryu,gareging/SDN_Framework,zangree/ryu,pichuang/ryu,shinpeimuraoka/ryu,iwaseyusuke/ryu,gareging/SDN_Framework,ttsubo/ryu,iwaseyusuke/ryu,OpenState-SDN/ryu,fkakuma/ryu,TakeshiTseng/ryu,iwaseyusuke/ryu,Tejas-Subramanya/RYU_MEC,hisaharu/ryu,fkakuma/ryu,lagopus/ryu-lagopus-ext,osrg/ryu,OpenState-SDN/ryu,takahashiminoru/ryu,fujita/ryu,takahashiminoru/ryu,zangree/ryu,Tejas-Subramanya/RYU_MEC,iwaseyusuke/ryu,shinpeimuraoka/ryu,Tejas-Subramanya/RYU_MEC,OpenState-SDN/ryu,fujita/ryu,lagopus/ryu-lagopus-ext,lagopus/ryu-lagopus-ext,habibiefaried/ryu,osrg/ryu,OpenState-SDN/ryu,Tejas-Subramanya/RYU_MEC,TakeshiTseng/ryu,ttsubo/ryu,hisaharu/ryu,takahashiminoru/ryu,shinpeimuraoka/ryu,Zouyiran/ryu,shinpeimuraoka/ryu,alanquillin/ryu,ttsubo/ryu,Zouyiran/ryu,fkakuma/ryu,TakeshiTseng/ryu,alanquillin/ryu,habibiefaried/ryu,iwaseyusuke/ryu,fujita/ryu,pichuang/ryu,pichuang/ryu,TakeshiTseng/ryu,Zouyiran/ryu,osrg/ryu,pichuang/ryu,Zouyiran/ryu