http/json: be more informative about the json schema mismatch error
http/json: be more informative about the json schema mismatch error

Before this patch, we might get error meessage like:
    info: HTTP request throw a schema_mismatch_exc_t with what = Expected object instead got: 2

However, we can tell user more by:
    info: HTTP request throw a schema_mismatch_exc_t with what = Expected 'object' instead got 'number': 2

Signed-off-by: Liu Aleaxander <c31ab6cae8e3070661bca47ec9430a3aeb4cd246@gmail.com>

eliangidoni/rethinkdb,jesseditson/rethinkdb,matthaywardwebdesign/rethinkdb,tempbottle/rethinkdb,Wilbeibi/rethinkdb,scripni/rethinkdb,grandquista/rethinkdb,KSanthanam/rethinkdb,ayumilong/rethinkdb,ajose01/rethinkdb,mbroadst/rethinkdb,ayumilong/rethinkdb,gavioto/rethinkdb,KSanthanam/rethinkdb,yakovenkodenis/rethinkdb,captainpete/rethinkdb,spblightadv/rethinkdb,rrampage/rethinkdb,pap/rethinkdb,matthaywardwebdesign/rethinkdb,marshall007/rethinkdb,lenstr/rethinkdb,greyhwndz/rethinkdb,RubenKelevra/rethinkdb,dparnell/rethinkdb,yakovenkodenis/rethinkdb,yaolinz/rethinkdb,niieani/rethinkdb,spblightadv/rethinkdb,yaolinz/rethinkdb,bpradipt/rethinkdb,greyhwndz/rethinkdb,pap/rethinkdb,victorbriz/rethinkdb,Qinusty/rethinkdb,pap/rethinkdb,sontek/rethinkdb,grandquista/rethinkdb,dparnell/rethinkdb,catroot/rethinkdb,Wilbeibi/rethinkdb,losywee/rethinkdb,sbusso/rethinkdb,yaolinz/rethinkdb,RubenKelevra/rethinkdb,bpradipt/rethinkdb,RubenKelevra/rethinkdb,marshall007/rethinkdb,yaolinz/rethinkdb,gdi2290/rethinkdb,mquandalle/rethinkdb,wkennington/rethinkdb,lenstr/rethinkdb,spblightadv/rethinkdb,dparnell/rethinkdb,eliangidoni/rethinkdb,matthaywardwebdesign/rethinkdb,eliangidoni/rethinkdb,losywee/rethinkdb,bchavez/rethinkdb,elkingtonmcb/rethinkdb,jesseditson/rethinkdb,robertjpayne/rethinkdb,sebadiaz/rethinkdb,victorbriz/rethinkdb,greyhwndz/rethinkdb,KSanthanam/rethinkdb,mcanthony/rethinkdb,elkingtonmcb/rethinkdb,grandquista/rethinkdb,niieani/rethinkdb,sbusso/rethinkdb,RubenKelevra/rethinkdb,gdi2290/rethinkdb,urandu/rethinkdb,ajose01/rethinkdb,AntouanK/rethinkdb,sebadiaz/rethinkdb,tempbottle/rethinkdb,RubenKelevra/rethinkdb,urandu/rethinkdb,mbroadst/rethinkdb,losywee/rethinkdb,tempbottle/rethinkdb,marshall007/rethinkdb,spblightadv/rethinkdb,ajose01/rethinkdb,ayumilong/rethinkdb,niieani/rethinkdb,Qinusty/rethinkdb,alash3al/rethinkdb,yakovenkodenis/rethinkdb,tempbottle/rethinkdb,4talesa/rethinkdb,Qinusty/rethinkdb,victorbriz/rethinkdb,JackieXie168/rethinkdb,wkennington/rethinkdb,urandu/rethinkdb,AntouanK/rethinkdb,losywee/rethinkdb,Qinusty/rethinkdb,robertjpayne/rethinkdb,rrampage/rethinkdb,JackieXie168/rethinkdb,lenstr/rethinkdb,mcanthony/rethinkdb,jesseditson/rethinkdb,wkennington/rethinkdb,robertjpayne/rethinkdb,captainpete/rethinkdb,jmptrader/rethinkdb,grandquista/rethinkdb,rrampage/rethinkdb,bchavez/rethinkdb,pap/rethinkdb,yakovenkodenis/rethinkdb,niieani/rethinkdb,rrampage/rethinkdb,jmptrader/rethinkdb,bchavez/rethinkdb,wojons/rethinkdb,grandquista/rethinkdb,victorbriz/rethinkdb,sontek/rethinkdb,bchavez/rethinkdb,rrampage/rethinkdb,dparnell/rethinkdb,elkingtonmcb/rethinkdb,grandquista/rethinkdb,sbusso/rethinkdb,gavioto/rethinkdb,mquandalle/rethinkdb,captainpete/rethinkdb,mcanthony/rethinkdb,gavioto/rethinkdb,jmptrader/rethinkdb,JackieXie168/rethinkdb,wojons/rethinkdb,mquandalle/rethinkdb,victorbriz/rethinkdb,sontek/rethinkdb,Qinusty/rethinkdb,robertjpayne/rethinkdb,scripni/rethinkdb,dparnell/rethinkdb,bpradipt/rethinkdb,bchavez/rethinkdb,alash3al/rethinkdb,jesseditson/rethinkdb,niieani/rethinkdb,lenstr/rethinkdb,jmptrader/rethinkdb,niieani/rethinkdb,elkingtonmcb/rethinkdb,bpradipt/rethinkdb,spblightadv/rethinkdb,4talesa/rethinkdb,bpradipt/rethinkdb,niieani/rethinkdb,robertjpayne/rethinkdb,bpradipt/rethinkdb,JackieXie168/rethinkdb,spblightadv/rethinkdb,greyhwndz/rethinkdb,rrampage/rethinkdb,ajose01/rethinkdb,urandu/rethinkdb,jmptrader/rethinkdb,alash3al/rethinkdb,ajose01/rethinkdb,robertjpayne/rethinkdb,mcanthony/rethinkdb,wujf/rethinkdb,mbroadst/rethinkdb,wkennington/rethinkdb,bchavez/rethinkdb,wujf/rethinkdb,gavioto/rethinkdb,eliangidoni/rethinkdb,pap/rethinkdb,ajose01/rethinkdb,gavioto/rethinkdb,alash3al/rethinkdb,marshall007/rethinkdb,urandu/rethinkdb,KSanthanam/rethinkdb,mbroadst/rethinkdb,alash3al/rethinkdb,mbroadst/rethinkdb,mbroadst/rethinkdb,JackieXie168/rethinkdb,wujf/rethinkdb,eliangidoni/rethinkdb,wkennington/rethinkdb,captainpete/rethinkdb,tempbottle/rethinkdb,jesseditson/rethinkdb,bchavez/rethinkdb,KSanthanam/rethinkdb,losywee/rethinkdb,Wilbeibi/rethinkdb,matthaywardwebdesign/rethinkdb,RubenKelevra/rethinkdb,KSanthanam/rethinkdb,greyhwndz/rethinkdb,robertjpayne/rethinkdb,catroot/rethinkdb,pap/rethinkdb,eliangidoni/rethinkdb,sontek/rethinkdb,captainpete/rethinkdb,robertjpayne/rethinkdb,AntouanK/rethinkdb,scripni/rethinkdb,eliangidoni/rethinkdb,sbusso/rethinkdb,ayumilong/rethinkdb,bpradipt/rethinkdb,4talesa/rethinkdb,victorbriz/rethinkdb,matthaywardwebdesign/rethinkdb,bchavez/rethinkdb,wujf/rethinkdb,gdi2290/rethinkdb,eliangidoni/rethinkdb,wkennington/rethinkdb,grandquista/rethinkdb,ayumilong/rethinkdb,JackieXie168/rethinkdb,losywee/rethinkdb,KSanthanam/rethinkdb,rrampage/rethinkdb,spblightadv/rethinkdb,Wilbeibi/rethinkdb,sebadiaz/rethinkdb,sbusso/rethinkdb,gavioto/rethinkdb,gdi2290/rethinkdb,sbusso/rethinkdb,sontek/rethinkdb,dparnell/rethinkdb,sebadiaz/rethinkdb,ayumilong/rethinkdb,sebadiaz/rethinkdb,lenstr/rethinkdb,greyhwndz/rethinkdb,RubenKelevra/rethinkdb,yakovenkodenis/rethinkdb,RubenKelevra/rethinkdb,elkingtonmcb/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