define testing with different ethereum clients

[ralph-pichler]

Different Ethereum clients are not equal in all aspects. Testing is mostly done with geth or ganache, therefore errors with other clients remain unnoticed. Swap should be regularly tested at least in conjunction with:

• geth
• ganache
• parity
• rsk

We should figure out a plan to make sure this tests happen regularly.

[ralph-pichler]

Current status of this:

• The generic swap test guide (https://hackmd.io/K8ye4VwURvWLR6F-fOiIHA?view) works for manually testing with all of the aforementioned clients.
• There is a single node geth chart in the ethersphere/helm repository which can be used for a test cluster.