add --pid-file option to cli
add --pid-file option to cli

Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

shinpeimuraoka/ryu,darjus-amzn/ryu,jkoelker/ryu,openvapour/ryu,lagopus/ryu-lagopus-ext,John-Lin/ryu,iwaseyusuke/ryu,ttsubo/ryu,haniehrajabi/ryu,darjus-amzn/ryu,sivaramakrishnansr/ryu,OpenState-SDN/ryu,fkakuma/ryu,takahashiminoru/ryu,habibiefaried/ryu,pichuang/ryu,gopchandani/ryu,evanscottgray/ryu,jalilm/ryu,zyq001/ryu,zyq001/ryu,osrg/ryu,diogommartins/ryu,fkakuma/ryu,gareging/SDN_Framework,fujita/ryu,muzixing/ryu,yamt/ryu,lsqtongxin/ryu,StephenKing/ryu,sivaramakrishnansr/ryu,umkcdcrg01/ryu_openflow,castroflavio/ryu,Tesi-Luca-Davide/ryu,umkcdcrg01/ryu_openflow,muzixing/ryu,sivaramakrishnansr/ryu,fujita/ryu,iwaseyusuke/ryu,fujita/ryu,iwaseyusuke/ryu,iwaseyusuke/ryu,umkcdcrg01/ryu_openflow,yamt/ryu,takahashiminoru/ryu,ysywh/ryu,diogommartins/ryu,pichuang/ryu,pichuang/ryu,lzppp/mylearning,castroflavio/ryu,TakeshiTseng/ryu,lagopus/ryu-lagopus-ext,Tesi-Luca-Davide/ryu,OpenState-SDN/ryu,ysywh/ryu,hisaharu/ryu,zangree/ryu,gopchandani/ryu,John-Lin/ryu,Zouyiran/ryu,shinpeimuraoka/ryu,lzppp/mylearning,StephenKing/summerschool-2015-ryu,habibiefaried/ryu,zangree/ryu,darjus-amzn/ryu,muzixing/ryu,hisaharu/ryu,sivaramakrishnansr/ryu,openvapour/ryu,TakeshiTseng/ryu,elahejalalpour/ELRyu,habibiefaried/ryu,alanquillin/ryu,jkoelker/ryu,shinpeimuraoka/ryu,ynkjm/ryu,OpenState-SDN/ryu,Zouyiran/ryu,yamt/ryu,fkakuma/ryu,Tejas-Subramanya/RYU_MEC,openvapour/ryu,Tejas-Subramanya/RYU_MEC,muzixing/ryu,gareging/SDN_Framework,zyq001/ryu,Zouyiran/ryu,jalilm/ryu,jkoelker/ryu,TakeshiTseng/ryu,haniehrajabi/ryu,Tejas-Subramanya/RYU_MEC,jazzmes/ryu,ttsubo/ryu,jalilm/ryu,ysywh/ryu,habibiefaried/ryu,evanscottgray/ryu,John-Lin/ryu,lzppp/mylearning,alanquillin/ryu,jalilm/ryu,osrg/ryu,elahejalalpour/ELRyu,haniehrajabi/ryu,hisaharu/ryu,muzixing/ryu,lsqtongxin/ryu,StephenKing/summerschool-2015-ryu,ysywh/ryu,gopchandani/ryu,StephenKing/summerschool-2015-ryu,StephenKing/ryu,zangree/ryu,hisaharu/ryu,StephenKing/ryu,Zouyiran/ryu,takahashiminoru/ryu,ttsubo/ryu,alanquillin/ryu,elahejalalpour/ELRyu,ynkjm/ryu,Tesi-Luca-Davide/ryu,haniehrajabi/ryu,StephenKing/ryu,iwaseyusuke/ryu,jazzmes/ryu,pichuang/ryu,castroflavio/ryu,diogommartins/ryu,TakeshiTseng/ryu,yamt/ryu,Tejas-Subramanya/RYU_MEC,Tejas-Subramanya/RYU_MEC,lzppp/mylearning,alyosha1879/ryu,John-Lin/ryu,alyosha1879/ryu,lsqtongxin/ryu,lagopus/ryu-lagopus-ext,OpenState-SDN/ryu,lsqtongxin/ryu,ynkjm/ryu,fujita/ryu,elahejalalpour/ELRyu,evanscottgray/ryu,elahejalalpour/ELRyu,ttsubo/ryu,jalilm/ryu,shinpeimuraoka/ryu,John-Lin/ryu,osrg/ryu,diogommartins/ryu,yamt/ryu,zangree/ryu,diogommartins/ryu,gopchandani/ryu,zyq001/ryu,habibiefaried/ryu,ynkjm/ryu,darjus-amzn/ryu,gareging/SDN_Framework,alanquillin/ryu,OpenState-SDN/ryu,lzppp/mylearning,takahashiminoru/ryu,haniehrajabi/ryu,lagopus/ryu-lagopus-ext,gopchandani/ryu,ynkjm/ryu,alyosha1879/ryu,fujita/ryu,TakeshiTseng/ryu,jazzmes/ryu,osrg/ryu,gareging/SDN_Framework,Tesi-Luca-Davide/ryu,StephenKing/ryu,takahashiminoru/ryu,gareging/SDN_Framework,osrg/ryu,sivaramakrishnansr/ryu,lsqtongxin/ryu,pichuang/ryu,fkakuma/ryu,Tesi-Luca-Davide/ryu,zangree/ryu,openvapour/ryu,Zouyiran/ryu,umkcdcrg01/ryu_openflow,darjus-amzn/ryu,StephenKing/summerschool-2015-ryu,shinpeimuraoka/ryu,ttsubo/ryu,ysywh/ryu,alyosha1879/ryu,fkakuma/ryu,alanquillin/ryu,zyq001/ryu,lagopus/ryu-lagopus-ext,openvapour/ryu,umkcdcrg01/ryu_openflow,StephenKing/summerschool-2015-ryu,hisaharu/ryu