Node name support in CLI

Now there is only one way to point at the ignite node in the CLI – `node-url` or `cluster-url` options. They are represented as an URL that sometimes is too annoying to type and remember. It would be much more user-friendly to have the second option here. I think node name could be used as a CLI option.

I propose to add `node-name` option to every command that requires `cluster-url` or `node-url`. So, the following user story would be possible:

> ignite
[disconnected]> connect node2
[node2]> connect node2
[node2]> node config show --node-name node1