Cleanup query keys output of Admin tool

1) Previously when the value bytes can't be deserialized it errored out
immediately and it does not print values of other nodes. You can do node
by node, but failed nodes can never be retrieved. Now if it fails, byte
array output will be printed.
2) When node does not have a key, it printed invalid metadata
exceptions for all other nodes. Now they are skipped in the output.
3) Does not report what all nodes had same value and which ones
differed.