Add more tests for generating transactions via the CLI

[evan-forbes]

If we would have had more tests that use the cli to generate transactions, then we would have noticed #132 sooner. The way we generate MsgWirePayForMessages is atypical for an cosmos-sdk chain in that we are actually generating and signing multiple iterations of the same transaction. We need to have better testing for this.

This should be completed either when completing #132 or directly after, as completing that will require a refactor of the current way we generate transactions using the cli.

[evan-forbes]

closing with #171