Update genutils to match module spec

[colin-axner]

Summary

Update genutils to latest module spec.

Problem Definition

I am trying to add the ability to query for gen txs from auth's rest. However, trying to decode into genutils.GenesisState causes an import cycle since all the files/types lie at the top level of the module.

Proposal

There is no keeper in this module, so I am not sure how this module will vary from the module spec. Maybe it follows everything, but just doesn't have an internal keeper folder?

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[fedekunze]

I started this refactor on #4757. Although I don't know what's the import cycle you mentioned. Can you provide more context so that I can get the refactor to solve that issue too?

[colin-axner]

Yea, so when trying to add querying for gen txs I do the following:

• Add ability to query gentxs using endpoint in x/auth/client/rest which calls genutils helper functions
• x/genutils calls x/auth/
• in module.go of x/auth it calls x/auth/client/rest

The main thing I am doing is, pulling genesis doc from tendermint, decoding the genesis doc using GenesisStateFromGenDoc then getting the genesis state using GetGenesisStateFromAppState. If these functions can't isolated from the dependency on x/auth then I can just implement the decoding, but I need access to the GenesisState type or I'd need to create a mock of it if it can't be isolated from the dependency on x/auth as well.