Add NotImplemented.ActiveIssue() method.
Add NotImplemented.ActiveIssue() method.

To enable drive to fix remaining "throw NotImplemented"'s
in code.

billwert/corefx,tijoytom/corefx,axelheer/corefx,mmitche/corefx,fgreinacher/corefx,seanshpark/corefx,the-dwyer/corefx,seanshpark/corefx,ViktorHofer/corefx,Jiayili1/corefx,seanshpark/corefx,ptoonen/corefx,zhenlan/corefx,yizhang82/corefx,Ermiar/corefx,JosephTremoulet/corefx,Jiayili1/corefx,mazong1123/corefx,parjong/corefx,rubo/corefx,parjong/corefx,Jiayili1/corefx,ptoonen/corefx,gkhanna79/corefx,zhenlan/corefx,cydhaselton/corefx,nbarbettini/corefx,axelheer/corefx,yizhang82/corefx,cydhaselton/corefx,seanshpark/corefx,shimingsg/corefx,DnlHarvey/corefx,billwert/corefx,rubo/corefx,parjong/corefx,ViktorHofer/corefx,Ermiar/corefx,stone-li/corefx,tijoytom/corefx,BrennanConroy/corefx,ptoonen/corefx,gkhanna79/corefx,parjong/corefx,jlin177/corefx,wtgodbe/corefx,krytarowski/corefx,nchikanov/corefx,zhenlan/corefx,MaggieTsang/corefx,dotnet-bot/corefx,alexperovich/corefx,MaggieTsang/corefx,ViktorHofer/corefx,JosephTremoulet/corefx,ericstj/corefx,DnlHarvey/corefx,mmitche/corefx,gkhanna79/corefx,zhenlan/corefx,jlin177/corefx,krk/corefx,stone-li/corefx,krytarowski/corefx,DnlHarvey/corefx,ravimeda/corefx,BrennanConroy/corefx,MaggieTsang/corefx,Jiayili1/corefx,ericstj/corefx,tijoytom/corefx,wtgodbe/corefx,jlin177/corefx,alexperovich/corefx,MaggieTsang/corefx,dotnet-bot/corefx,tijoytom/corefx,seanshpark/corefx,shimingsg/corefx,ViktorHofer/corefx,ravimeda/corefx,JosephTremoulet/corefx,twsouthwick/corefx,Jiayili1/corefx,fgreinacher/corefx,stone-li/corefx,axelheer/corefx,yizhang82/corefx,mmitche/corefx,fgreinacher/corefx,ravimeda/corefx,shimingsg/corefx,wtgodbe/corefx,rubo/corefx,Ermiar/corefx,cydhaselton/corefx,tijoytom/corefx,JosephTremoulet/corefx,twsouthwick/corefx,twsouthwick/corefx,mazong1123/corefx,MaggieTsang/corefx,ptoonen/corefx,DnlHarvey/corefx,parjong/corefx,wtgodbe/corefx,cydhaselton/corefx,ptoonen/corefx,krk/corefx,dotnet-bot/corefx,DnlHarvey/corefx,ViktorHofer/corefx,cydhaselton/corefx,fgreinacher/corefx,zhenlan/corefx,JosephTremoulet/corefx,alexperovich/corefx,ericstj/corefx,MaggieTsang/corefx,nbarbettini/corefx,ViktorHofer/corefx,krytarowski/corefx,nchikanov/corefx,Ermiar/corefx,richlander/corefx,alexperovich/corefx,yizhang82/corefx,ViktorHofer/corefx,krk/corefx,Ermiar/corefx,shimingsg/corefx,nbarbettini/corefx,nbarbettini/corefx,twsouthwick/corefx,nchikanov/corefx,tijoytom/corefx,mmitche/corefx,nbarbettini/corefx,ravimeda/corefx,krytarowski/corefx,mmitche/corefx,parjong/corefx,ericstj/corefx,stone-li/corefx,dotnet-bot/corefx,nbarbettini/corefx,krk/corefx,Ermiar/corefx,gkhanna79/corefx,ericstj/corefx,Jiayili1/corefx,stone-li/corefx,ptoonen/corefx,nchikanov/corefx,krk/corefx,axelheer/corefx,alexperovich/corefx,yizhang82/corefx,richlander/corefx,mazong1123/corefx,mmitche/corefx,cydhaselton/corefx,gkhanna79/corefx,krk/corefx,dotnet-bot/corefx,wtgodbe/corefx,the-dwyer/corefx,twsouthwick/corefx,stone-li/corefx,dotnet-bot/corefx,mmitche/corefx,tijoytom/corefx,the-dwyer/corefx,ericstj/corefx,gkhanna79/corefx,billwert/corefx,alexperovich/corefx,JosephTremoulet/corefx,ericstj/corefx,DnlHarvey/corefx,billwert/corefx,the-dwyer/corefx,richlander/corefx,nbarbettini/corefx,mazong1123/corefx,BrennanConroy/corefx,parjong/corefx,the-dwyer/corefx,mazong1123/corefx,jlin177/corefx,richlander/corefx,Jiayili1/corefx,the-dwyer/corefx,shimingsg/corefx,twsouthwick/corefx,billwert/corefx,shimingsg/corefx,nchikanov/corefx,axelheer/corefx,ravimeda/corefx,ptoonen/corefx,wtgodbe/corefx,axelheer/corefx,alexperovich/corefx,yizhang82/corefx,richlander/corefx,JosephTremoulet/corefx,seanshpark/corefx,gkhanna79/corefx,rubo/corefx,seanshpark/corefx,dotnet-bot/corefx,mazong1123/corefx,krytarowski/corefx,richlander/corefx,MaggieTsang/corefx,twsouthwick/corefx,stone-li/corefx,the-dwyer/corefx,mazong1123/corefx,billwert/corefx,yizhang82/corefx,krytarowski/corefx,nchikanov/corefx,zhenlan/corefx,rubo/corefx,zhenlan/corefx,jlin177/corefx,krk/corefx,ravimeda/corefx,Ermiar/corefx,nchikanov/corefx,cydhaselton/corefx,ravimeda/corefx,wtgodbe/corefx,shimingsg/corefx,richlander/corefx,jlin177/corefx,jlin177/corefx,billwert/corefx,DnlHarvey/corefx,krytarowski/corefx