Upgrade to tm version 23.0. (#1927)

* Start upgrade. Currently go test ./... hangs.

* (squash this) Fix staking tests

* wip

* note what changes need to be made to make this work on tm v0.23.0

* Fix addr -> pubkey map

* cleanup code

* Fix slashing test failures except for begin blocker

* fix all slashing tests

* fix lcd tests

* Address PR comments

* add link to changelog.

* (wip) start making addrToPubkey map persisted. Since amino can't handle maps,
we have to change from what this commit is doing.

* Use the correct method of storing a map

* (squash this) address PR comments

* Did you run 'make'?

* remove gaiadebug binary

cmd/gaia/app/app.go

@@ -148,7 +148,8 @@ func (app *GaiaApp) BeginBlocker(ctx sdk.Context, req abci.RequestBeginBlock) ab
 func (app *GaiaApp) EndBlocker(ctx sdk.Context, req abci.RequestEndBlock) abci.ResponseEndBlock {
 	tags := gov.EndBlocker(ctx, app.govKeeper)
 	validatorUpdates := stake.EndBlocker(ctx, app.stakeKeeper)
-
+	// Add these new validators to the addr -> pubkey map.
+	app.slashingKeeper.AddValidators(ctx, validatorUpdates)
 	return abci.ResponseEndBlock{
 		ValidatorUpdates: validatorUpdates,
 		Tags:             tags,
@@ -181,6 +182,9 @@ func (app *GaiaApp) initChainer(ctx sdk.Context, req abci.RequestInitChain) abci
 		// return sdk.ErrGenesisParse("").TraceCause(err, "")
 	}
 
+	// load the address to pubkey map
+	slashing.InitGenesis(ctx, app.slashingKeeper, genesisState.StakeData)
+
 	gov.InitGenesis(ctx, app.govKeeper, gov.DefaultGenesisState())
 
 	return abci.ResponseInitChain{