Clean up previous lcov results when generating new ones.
Clean up previous lcov results when generating new ones.

cgaebel/mordor,cgaebel/mordor,mtanski/mordor,ccutrer/mordor,mozy/mordor,ccutrer/mordor,mozy/mordor,ccutrer/mordor,adfin/mordor,mtanski/mordor,adfin/mordor,adfin/mordor,mozy/mordor,mtanski/mordor