zetacore : add tests for commonly used cosmos CLI commands

[kingpinXD]

We should also include some tests of commonly used cosmos rpcs via CLI
Cosmos SDK has unit and integration tests to verify its functionality, but we should have some tests to confirm that we are using it correctly.
The simulation tests interact with all the messages, but they do not go through the CLI

For example, the recent change to staking tx, which modified the cli command to accept a json file instead of the individual parameters, should have been caught by us.
Although this is minor, as the message itself is being tested. It would be good to have