packet lib: fix ipv4 flags bitshift
packet lib: fix ipv4 flags bitshift

Fixed flags bitshift.

Signed-off-by: HIYAMA Manabu <ca8e8d5cce4616c953c505dbe74ba563fd9d95e0@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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