watch-only addresses doesn't work properly in bitcoind v0.10.0
It seems that v0.10.0 is not documented yet, apart from the release notes. Referring to the github repository: Issue #4045

It appears that a boolean watchonly argument is needed at the end of those commands. Thus below commands would work:

bitcoin-cli listtransactions testacc 100 0 true


or 

bitcoin-cli listreceivedbyaddress 0 false true [account, includeempty, includewatchonly]