kermit: Add a quick 'kermit list' subcommand
kermit: Add a quick 'kermit list' subcommand

To quickly list all items in a shard. This is equivalent to grepping for
the empty-string with kermit grep foo.shard '', but much easier to
remember.

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib