Parallel scanner does not filter on CV

io.fluo.impl.ParalllelSnapshotScanner does not filter on column vis. It uses an Accumulo batch scanner and fetches cf and cq, but does not filter the results on cv.

Start by inspecting io.fluo.impl.ParalllelSnapshotScanner and trace how its Accumulo batch scanner fetches column family, column qualifier, and column visibility. Verify that results are filtered on column visibility, then confirm scans no longer return entries with an unmatched cv.

Written by the indexing model from the issue text.