Add a missing accessor to retrieve the max number of KVs on a Scanner.
Add a missing accessor to retrieve the max number of KVs on a Scanner.

hhshuai/asynchbase,adityakishore/asynchbase,manolama/asynchbase,angushe/asynchbase,OpenTSDB/asynchbase,tempbottle/asynchbase,manolama/asynchbase,mapr/asynchbase,OpenTSDB/asyncbigtable,tsuna/asynchbase,mway08/asynchbase,SteamShon/asynchbase,Connexity/asynchbase,OpenTSDB/asynchbase,hhshuai/asynchbase,tsuna/asynchbase,tempbottle/asynchbase,Connexity/asynchbase,nvoron23/asynchbase,manolama/asyncbigtable,angushe/asynchbase,mapr/asynchbase,SteamShon/asynchbase,nvoron23/asynchbase,adityakishore/asynchbase,mway08/asynchbase,yuzhu712/asynchbase,yuzhu712/asynchbase,pythian/asynchbase