Code review: 139030043:  Clean up of filestat parser.
Code review: 139030043:  Clean up of filestat parser.

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