rename NXTRequest to NiciraHeader
rename NXTRequest to NiciraHeader

We use NXTRequest for Switch-to-Controller messages so let's rename it
to an appropriate name.

Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>
Reviewed-by: Isaku Yamahata <4b3abd66323411eeceff090ab3754dd766fc4b25@valinux.co.jp>

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