add ability to list all public & private actions & packages with a single command

as a user, i should be able to list all private and public actions & packages with a single command -- without having to know any names of publiic packages.

for example, i can imagine a syntax like
`wsk package list --all`
`wsk action list --all`

Start with the CLI entry points for `wsk package list` and `wsk action list`, then inspect how they currently handle named public packages. Done means a single `--all` command for each resource lists both public and private actions or packages without requiring package names; add or run the relevant CLI tests if available.

Written by the indexing model from the issue text.