test_parser: prepare for tests with packet_data_generator3
test_parser: prepare for tests with packet_data_generator3

Be able to specify xid in packet.json files, as data generated by
packet_data_generator3 have non-zero xid.  Also, give some detail
on data mismatch in order to ease debugging.

Signed-off-by: IWAMOTO Toshihiro <8e41ae29694291a01b8efca6b4a0005a87ddb93e@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

takahashiminoru/ryu,Tejas-Subramanya/RYU_MEC,OpenState-SDN/ryu,osrg/ryu,shinpeimuraoka/ryu,lagopus/ryu-lagopus-ext,fujita/ryu,elahejalalpour/ELRyu,gareging/SDN_Framework,gareging/SDN_Framework,alanquillin/ryu,alanquillin/ryu,pichuang/ryu,OpenState-SDN/ryu,shinpeimuraoka/ryu,iwaseyusuke/ryu,Zouyiran/ryu,iwaseyusuke/ryu,lagopus/ryu-lagopus-ext,darjus-amzn/ryu,John-Lin/ryu,shinpeimuraoka/ryu,Tejas-Subramanya/RYU_MEC,shinpeimuraoka/ryu,zyq001/ryu,fkakuma/ryu,fujita/ryu,hisaharu/ryu,iwaseyusuke/ryu,alanquillin/ryu,zyq001/ryu,fkakuma/ryu,Zouyiran/ryu,zangree/ryu,darjus-amzn/ryu,StephenKing/ryu,zangree/ryu,ttsubo/ryu,takahashiminoru/ryu,Zouyiran/ryu,zyq001/ryu,Zouyiran/ryu,alanquillin/ryu,osrg/ryu,zangree/ryu,diogommartins/ryu,fujita/ryu,elahejalalpour/ELRyu,osrg/ryu,lagopus/ryu-lagopus-ext,elahejalalpour/ELRyu,fkakuma/ryu,lagopus/ryu-lagopus-ext,fkakuma/ryu,zangree/ryu,TakeshiTseng/ryu,fkakuma/ryu,TakeshiTseng/ryu,takahashiminoru/ryu,pichuang/ryu,TakeshiTseng/ryu,habibiefaried/ryu,Zouyiran/ryu,darjus-amzn/ryu,OpenState-SDN/ryu,hisaharu/ryu,gareging/SDN_Framework,zyq001/ryu,gareging/SDN_Framework,diogommartins/ryu,gareging/SDN_Framework,pichuang/ryu,pichuang/ryu,StephenKing/ryu,zangree/ryu,iwaseyusuke/ryu,elahejalalpour/ELRyu,ttsubo/ryu,darjus-amzn/ryu,hisaharu/ryu,habibiefaried/ryu,hisaharu/ryu,osrg/ryu,Tejas-Subramanya/RYU_MEC,habibiefaried/ryu,pichuang/ryu,fujita/ryu,StephenKing/ryu,habibiefaried/ryu,lagopus/ryu-lagopus-ext,John-Lin/ryu,fujita/ryu,diogommartins/ryu,zyq001/ryu,TakeshiTseng/ryu,alanquillin/ryu,shinpeimuraoka/ryu,takahashiminoru/ryu,John-Lin/ryu,TakeshiTseng/ryu,StephenKing/ryu,John-Lin/ryu,OpenState-SDN/ryu,darjus-amzn/ryu,iwaseyusuke/ryu,ttsubo/ryu,ttsubo/ryu,StephenKing/ryu,diogommartins/ryu,osrg/ryu,OpenState-SDN/ryu,takahashiminoru/ryu,Tejas-Subramanya/RYU_MEC,elahejalalpour/ELRyu,hisaharu/ryu,John-Lin/ryu,ttsubo/ryu,habibiefaried/ryu,diogommartins/ryu,Tejas-Subramanya/RYU_MEC