Code review: 58360043:  More fixes in l2t_csv.py.
Code review: 58360043:  More fixes in l2t_csv.py.

joachimmetz/plaso,Onager/plaso,log2timeline/plaso,joachimmetz/plaso,kiddinn/plaso,kiddinn/plaso,log2timeline/plaso,rgayon/plaso,rgayon/plaso,kiddinn/plaso,rgayon/plaso,Onager/plaso