Testing update of Tendermint configuration

[Karrenbelt]

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Right now in e2e test for registration start up we exchange tendermint configurations, update the genesis file, and restart the tendermint nodes. However, since Tendermint is already running prior to this and the genesis file already exists containing the information of the other nodes, the tests offer no guarantee that the updating and restarting is working in accordance with our expectations. We thus should add a test to see that we can indeed restart the network with an altered genesis file.

On a side note, we will possibly transition to a setup where Tendermint is no running before registration start-up in the near future; it certainly will not be expected to have the necessary information on the other nodes that is currently present before starting.