As a user I can add & remove nodes to/from a testbed

[frrist]

The add command should be added as a subcommand to the existing testbed command. e.g.

Create a testbed:
iptb testbed create --count 5 --type localipfs

Add 3 nodes to the testbed
iptb testbed add --count 3 --type localipfs

There are a couple different ways to handle remove, whomever decides to pick this up -- let's have a discussion here before implementing 😄

[dgrisham]

With this, would we allow mixing node types, e.g.

$ iptb testbed create --count 2 --type localipfs
$ iptb testbed add --count 2 --type dockeripfs

? Or would we ensure that you could only add nodes of the same type that the testbed already has? From what I've seen I don't think mixing node types would break anything, and I could see that being potentially useful (e.g. one local node that talks to a bunch of docker nodes).

[frrist]

I think initially restricting this to the same testbed will make implementation easier, later we can expand this to work with multiple testbeds (probably deserves its own issue).

From what I've seen I don't think mixing node types would break anything, and I could see that being potentially useful

I agree with will be very useful, however, as an example, getting a docker plugin to work with a local plugin will require that the docker file is written such that the appropriate ports are exposed for connection, and that the containers can be dialed by local processes -- could be tricky.