CLI: Reduce number of command layers where possible and appropriate

[jsolbrig]

Blocking issues

This is likely blocked by #573 or vice versa.

Requested Update

Description

There are several locations where the CLI is overly verbose because an extra command level is required. Here is a non-exhaustive list of examples:

• geoips list plugins <interface_name> -> geoips list <interface_name>
• geoips get plugin <interface_name> <plugin_name> -> geoips get <interface_name> <plugin_name>

We should find all instances where we can remove an intermediate command and still have the CLI make sense grammatically. geoips list algorithms makes just as much sense as geoips list plugins algorithms. In some cases, this will require adding an additional command for listing everything. For example, if we remove geoips list plugins in favor of geoips list <interface_name> we might want to add geoips list all-plugins or something similar.

Note that the examples given here all relate to <interface_name>. There may be other examples of subcommands that can be moved upwards.

Background and Motivation

This will reduce verbosity and makes the CLI feel more natural. It is a bit more like Kubernetes which seems to be a well thought-out CLI.

Checklist for Completion

• [ ] Find and list in this issue all locations where we can and should remove verbosity.
• [ ] Remove the appropriate command level and replace with the lower-level commands.
• [ ] Determine where "all" commands should be added and add them where appropriate (e.g. geoips list all-plugins).
• [ ] Ensure that unit tests continue to pass.
• [ ] Update documentation as appropriate, auto-generating where possible.