add 'knownbug' testcase metadata property doc
add 'knownbug' testcase metadata property doc

nivertech/duktape,skomski/duktape,sloth4413/duktape,daimajia/duktape,kphillisjr/duktape,reqshark/duktape,skomski/duktape,chenyaqiuqiu/duktape,markand/duktape,markand/duktape,daimajia/duktape,haosu1987/duktape,eddieh/duktape,skomski/duktape,zeropool/duktape,zeropool/duktape,reqshark/duktape,markand/duktape,nivertech/duktape,kphillisjr/duktape,zeropool/duktape,eddieh/duktape,eddieh/duktape,markand/duktape,sloth4413/duktape,reqshark/duktape,zeropool/duktape,sloth4413/duktape,markand/duktape,jmptrader/duktape,tassmjau/duktape,skomski/duktape,tassmjau/duktape,harold-b/duktape,kphillisjr/duktape,chenyaqiuqiu/duktape,svaarala/duktape,sloth4413/duktape,markand/duktape,chenyaqiuqiu/duktape,tassmjau/duktape,zeropool/duktape,rwaldron/duktape,rwaldron/duktape,eddieh/duktape,skomski/duktape,haosu1987/duktape,chenyaqiuqiu/duktape,svaarala/duktape,harold-b/duktape,harold-b/duktape,kphillisjr/duktape,nivertech/duktape,thurday/duktape,rwaldron/duktape,skomski/duktape,reqshark/duktape,sloth4413/duktape,kphillisjr/duktape,haosu1987/duktape,skomski/duktape,kphillisjr/duktape,sloth4413/duktape,pombredanne/duktape,sloth4413/duktape,kphillisjr/duktape,haosu1987/duktape,chenyaqiuqiu/duktape,svaarala/duktape,tassmjau/duktape,eddieh/duktape,rwaldron/duktape,kphillisjr/duktape,chenyaqiuqiu/duktape,thurday/duktape,harold-b/duktape,kphillisjr/duktape,pombredanne/duktape,markand/duktape,pombredanne/duktape,pombredanne/duktape,haosu1987/duktape,sloth4413/duktape,zeropool/duktape,harold-b/duktape,thurday/duktape,reqshark/duktape,haosu1987/duktape,markand/duktape,daimajia/duktape,sloth4413/duktape,chenyaqiuqiu/duktape,jmptrader/duktape,zeropool/duktape,reqshark/duktape,thurday/duktape,nivertech/duktape,harold-b/duktape,tassmjau/duktape,jmptrader/duktape,svaarala/duktape,daimajia/duktape,pombredanne/duktape,eddieh/duktape,jmptrader/duktape,tassmjau/duktape,thurday/duktape,nivertech/duktape,haosu1987/duktape,jmptrader/duktape,haosu1987/duktape,tassmjau/duktape,chenyaqiuqiu/duktape,eddieh/duktape,rwaldron/duktape,tassmjau/duktape,skomski/duktape,thurday/duktape,tassmjau/duktape,thurday/duktape,haosu1987/duktape,markand/duktape,svaarala/duktape,skomski/duktape,jmptrader/duktape,sloth4413/duktape,nivertech/duktape,jmptrader/duktape,nivertech/duktape,harold-b/duktape,jmptrader/duktape,reqshark/duktape,pombredanne/duktape,eddieh/duktape,pombredanne/duktape,pombredanne/duktape,chenyaqiuqiu/duktape,harold-b/duktape,chenyaqiuqiu/duktape,pombredanne/duktape,markand/duktape,jmptrader/duktape,nivertech/duktape,nivertech/duktape,reqshark/duktape,eddieh/duktape,svaarala/duktape,zeropool/duktape,svaarala/duktape,thurday/duktape,thurday/duktape,skomski/duktape,daimajia/duktape,reqshark/duktape,tassmjau/duktape,haosu1987/duktape,reqshark/duktape,zeropool/duktape,pombredanne/duktape,rwaldron/duktape,zeropool/duktape,svaarala/duktape,harold-b/duktape,harold-b/duktape,thurday/duktape,jmptrader/duktape,kphillisjr/duktape,nivertech/duktape,daimajia/duktape,eddieh/duktape,svaarala/duktape