Create tool for quickly setting up enviroments for compatibility tests

[gorbak25]

When I was checking compatibility of the withdraw and deposit transaction with epoch I noticed that setting up and managing the test environment takes a lot of time. Additionally the logs are not separated and easily accessible and manual testing on a multi computer network would be tedious.

If we limit ourself to a single machine this could be done with docker (or in the multi computer version with kubernetes) but even then obtaining and managing multiple REPL shells in the nodes would be tedious.

The target of this issue is to create a helper tool for managing and performing manual tests(or partially automated tests) on multiple epoch and elixir nodes on different computers(additionally each computer must support many nodes simultaneously).

Contrary to the multi-node test framework this tool should create test environments for manual or partially automated tests, additionally the logs for each instance should be easily accessible and kept separate.

I think the pwnlib library from python2 would be ideal for the job(python3 support is still WIP) - this is why the tool will be written in python.

What functionality is needed:

• Create non interfering elixir and epoch instances on the same computer.
• Create epoch and elixir instances remotely via SSH - additionally if a firewall is present use SSH port forwarding.
• Ability to get a REPL shell with colors :) in any remote or local node.
• Download logs from remote nodes to the local computer.
• Connect nodes to each other
• Connect nodes into clusters and see what happens if multiple clusters will try to connect with each other at the same time
• Semi automatic tests for checking whether tx gossip works, block gossip works etc.
• Auto-creation of channels between any nodes.

More ideas would be nice :)