add scp option

[deitch]

We should add eden eve scp in addition to the eden eve ssh. We often need to pull files from the host; this makes it much easier.

[giggsoff]

But it needs to install scp inside EVE.

[deitch]

It can add it if needed. But you're right, let's add it to pillar. It's useful.

[rvs]

I don't think it should be in pillar by default -- arguably it can be added to sshd container but that would require a roundtrip with linuxkit maintainers.

[deitch]

I will make that happen. Let's leave this open until then.

[deitch]

This is being fixed via lf-edge/eve#1546
Once that is in, we can close this.

[rvs]

Actually I don't think it'll be fixed -- but that's a separate conversation ;-)