Packet: fix iterator
Packet: fix iterator

replace Packet.__iter__ which doesn't work in cases like nested iterations.

Signed-off-by: YAMAMOTO Takashi <458bba2e4a8704776b33478100c98529b639cd9e@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

jkoelker/ryu,muzixing/ryu,lagopus/ryu-lagopus-ext,gareging/SDN_Framework,torufuru/oolhackathon,sivaramakrishnansr/ryu,diogommartins/ryu,ynkjm/ryu,John-Lin/ryu,hisaharu/ryu,evanscottgray/ryu,Tejas-Subramanya/RYU_MEC,gopchandani/ryu,elahejalalpour/ELRyu,John-Lin/ryu,Tesi-Luca-Davide/ryu,alanquillin/ryu,umkcdcrg01/ryu_openflow,jalilm/ryu,takahashiminoru/ryu,hisaharu/ryu,jalilm/ryu,OpenState-SDN/ryu,osrg/ryu,gopchandani/ryu,Zouyiran/ryu,Zouyiran/ryu,haniehrajabi/ryu,fkakuma/ryu,o3project/ryu-oe,jazzmes/ryu,StephenKing/summerschool-2015-ryu,iwaseyusuke/ryu,torufuru/OFPatchPanel,shinpeimuraoka/ryu,habibiefaried/ryu,takahashiminoru/ryu,ysywh/ryu,darjus-amzn/ryu,hisaharu/ryu,yamada-h/ryu,gopchandani/ryu,hisaharu/ryu,Tejas-Subramanya/RYU_MEC,openvapour/ryu,osrg/ryu,OpenState-SDN/ryu,jazzmes/ryu,gareging/SDN_Framework,openvapour/ryu,alanquillin/ryu,jalilm/ryu,Tesi-Luca-Davide/ryu,Zouyiran/ryu,diogommartins/ryu,zyq001/ryu,lzppp/mylearning,ntts-clo/mld-ryu,ynkjm/ryu,shinpeimuraoka/ryu,evanscottgray/ryu,lsqtongxin/ryu,elahejalalpour/ELRyu,yamt/ryu,OpenState-SDN/ryu,darjus-amzn/ryu,diogommartins/ryu,zyq001/ryu,fujita/ryu,fkakuma/ryu,openvapour/ryu,gareging/SDN_Framework,fujita/ryu,takahashiminoru/ryu,pichuang/ryu,alanquillin/ryu,elahejalalpour/ELRyu,evanscottgray/ryu,Tesi-Luca-Davide/ryu,darjus-amzn/ryu,takahashiminoru/ryu,StephenKing/ryu,umkcdcrg01/ryu_openflow,ttsubo/ryu,ysywh/ryu,StephenKing/summerschool-2015-ryu,o3project/ryu-oe,castroflavio/ryu,zyq001/ryu,pichuang/ryu,zangree/ryu,shinpeimuraoka/ryu,openvapour/ryu,ntts-clo/mld-ryu,openvapour/ryu,jazzmes/ryu,StephenKing/ryu,sivaramakrishnansr/ryu,zangree/ryu,ttsubo/ryu,torufuru/oolhackathon,ysywh/ryu,hisaharu/ryu,sivaramakrishnansr/ryu,StephenKing/summerschool-2015-ryu,lzppp/mylearning,StephenKing/summerschool-2015-ryu,fkakuma/ryu,StephenKing/summerschool-2015-ryu,lsqtongxin/ryu,Tejas-Subramanya/RYU_MEC,shinpeimuraoka/ryu,fujita/ryu,ttsubo/ryu,yamada-h/ryu,pichuang/ryu,ntts-clo/ryu,habibiefaried/ryu,muzixing/ryu,Tejas-Subramanya/RYU_MEC,zangree/ryu,castroflavio/ryu,mikhaelharswanto/ryu,haniehrajabi/ryu,osrg/ryu,darjus-amzn/ryu,iwaseyusuke/ryu,ntts-clo/ryu,jkoelker/ryu,Tesi-Luca-Davide/ryu,takahashiminoru/ryu,ynkjm/ryu,lsqtongxin/ryu,shinpeimuraoka/ryu,ysywh/ryu,osrg/ryu,iwaseyusuke/ryu,diogommartins/ryu,fkakuma/ryu,StephenKing/ryu,StephenKing/ryu,ynkjm/ryu,osrg/ryu,gareging/SDN_Framework,haniehrajabi/ryu,yamt/ryu,yamt/ryu,TakeshiTseng/ryu,lzppp/mylearning,zangree/ryu,iwaseyusuke/ryu,alyosha1879/ryu,zangree/ryu,ynkjm/ryu,diogommartins/ryu,ttsubo/ryu,muzixing/ryu,StephenKing/ryu,gareging/SDN_Framework,lagopus/ryu-lagopus-ext,darjus-amzn/ryu,jkoelker/ryu,habibiefaried/ryu,habibiefaried/ryu,jalilm/ryu,OpenState-SDN/ryu,umkcdcrg01/ryu_openflow,elahejalalpour/ELRyu,lagopus/ryu-lagopus-ext,Zouyiran/ryu,sivaramakrishnansr/ryu,alanquillin/ryu,fkakuma/ryu,lagopus/ryu-lagopus-ext,pichuang/ryu,mikhaelharswanto/ryu,yamt/ryu,John-Lin/ryu,jalilm/ryu,habibiefaried/ryu,TakeshiTseng/ryu,Zouyiran/ryu,zyq001/ryu,ttsubo/ryu,TakeshiTseng/ryu,Tesi-Luca-Davide/ryu,John-Lin/ryu,zyq001/ryu,alyosha1879/ryu,castroflavio/ryu,alyosha1879/ryu,sivaramakrishnansr/ryu,gopchandani/ryu,haniehrajabi/ryu,OpenState-SDN/ryu,ysywh/ryu,alyosha1879/ryu,TakeshiTseng/ryu,lzppp/mylearning,lsqtongxin/ryu,Tejas-Subramanya/RYU_MEC,iwaseyusuke/ryu,torufuru/OFPatchPanel,torufuru/oolhackathon,fujita/ryu,pichuang/ryu,umkcdcrg01/ryu_openflow,lzppp/mylearning,yamt/ryu,fujita/ryu,haniehrajabi/ryu,elahejalalpour/ELRyu,muzixing/ryu,gopchandani/ryu,umkcdcrg01/ryu_openflow,lagopus/ryu-lagopus-ext,lsqtongxin/ryu,muzixing/ryu,TakeshiTseng/ryu,alanquillin/ryu,John-Lin/ryu