Use glob_utils.graphite_glob() to list metrics & directories.
Use glob_utils.graphite_glob() to list metrics & directories.

This fix affect the behavior of 'read', 'du', 'copy' and 'list' commands.
Currently accessor.glob_metric_names() is used but return in some cases invalid results
graphite_glob() post filter accessor.glob_metric_names() to ensure output correctness
A better but more involved fix would be to fix glob_metric_names() cassandra implementation and trust its output but some code might rely on the current behavior.

criteo/biggraphite,Thib17/biggraphite,Thib17/biggraphite,iksaif/biggraphite,criteo/biggraphite,criteo/biggraphite,Thib17/biggraphite,Thib17/biggraphite,iksaif/biggraphite,criteo/biggraphite,iksaif/biggraphite,iksaif/biggraphite