Merge PR #2524: Replace GenTx with StdTx

Rework the process of loading a genesis.json file to load a starting app state and set of initial transactions to process.

* New function to create genesis account from MsgCreateValidator
* Add arg to PrintUnsignedStdTx() to actually operate in offline mode
* New func processStdTxs()
* Remove gen-tx command
* Cleanup, return validators as they need to be written into genesis.json
* Modify gaiad init to allow auto-create of stdTx
* Remove server/testnet.go
* Don't load node_key.json, which might not be available
* Get the txs through DeliverTx
* Add app.slashingKeeper.AddValidators at the end of genesis
* On InitChain(), Signature's account number must be 0
* Add (tentative?) command to generate {node_key,priv_validator}.json files
* Reintroduce gaiad testnet
* Prompt user for passwords
* Update gaia to work with auth.StdTx
* Remove test_utils, NewTestGaiaAppGenState is now deprecated
* Combine --genesis-format and --generate-only
* Improve sign command's --offline flag documentation
* Moniker must be set
* Call app.slashingKeeper.AddValidators() even if len(txs) == 0
* Refactoring, introduce gaiad init --skip-genesis, code cleanup
* Drop unnecessary workaround to make lcd_tests pass
* Reintroduce gentx
* Simple name changes, GenesisState.Txs -> .GenTxs; OWK -> OverwriteKey; OverwriteKeys -> OverwriteKey

docs/getting-started/join-testnet.md

@@ -15,7 +15,7 @@ These instructions are for setting up a brand new full node from scratch.
 First, initialize the node and create the necessary config files:
 
 ```bash
-gaiad init --name <your_custom_name>
+gaiad init --skip-genesis --name <your_custom_name>
 ```
 
 ::: warning Note