init: Add default skaffold-config name?

[corneliusweig]

Since #2437 the skaffold.yaml can have a metadata.name field. With upcoming changes for configurable kubecontext, this name-field needs to be set when creating a project-kubeContext relation (see #2384 (comment) for details).

So far, skaffold init is completely ignorant about this field, but I think we can make our users' lives easier if init takes care of the name field. There are two basic options:

1. Prompt the user for a name (with a suggestion). The downside here is that skaffold init will obviously require more user interaction.
2. Provide a sane default without prompting the user.

Both options need a sane default. A reasonable default value could be to use the directory basename of the current working dir.

So what do you think? Should skaffold init do that, and what should be the default?

[nkubala]

yeah I think we should try and have as little user input in skaffold init as possible. i'm fine with putting a default in, your suggestion of the current directory basename seems reasonable to me.