ofctl_rest: improve readability of the result of MeterFeatures
ofctl_rest: improve readability of the result of MeterFeatures

although 'band_types' of MeterFeatures were bitmaps of supported band types, it was expressed numerically.
this patch makes 'band_types' human-readable.

e.g.)

  curl http://localhost:8080/stats/meterfeatures/8796750050962
  {
    "8796750050962": [
      {
        "max_meter": 16777216,
        "max_color": 0,
        "max_band": 255,
        "band_types": ["DROP", "DSCP_REMARK"]
      }
    ]
  }

Signed-off-by: Yuichi Ito <7a83edf5b53f0b21d4182a3da7518164ce03dc3a@gmail.com>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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