Fix #119 - adjust du output parser to HADOOP-6857

HADOOP-6857 introduced another column (spaceConsumed) in du output.
Since snakebite still outputs only size (length), and path for now we
ignore spaceConsumed - this should change in #120.
Fix #109 - touchz support for multiple items

Initial interface supports list as input for touchz, but snakebite only
handled the first _created_ file and then stopped. Add support for
multiple items.
As a side note we need to refactor _find_items to provide one common way
of handling multiple items and error reporting - current situation is
tedious! Whole CLI support requires complete rewrite to properly support
multiple inputs and error handling.