of1.3: fix OFP_DESC_PACK_STR
of1.3: fix OFP_DESC_PACK_STR

File "/Users/fujita/git/ryu/ryu/ofproto/ofproto_v1_3.py", line 533, in <module>
  DESC_STR_LEN + 'c'
TypeError: cannot concatenate 'str' and 'int' objects

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

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