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## Description
Closes: #8961
SDK allows InitGenesis to return with an empty validator set. In practice, the error for an empty validator set gets thrown in tendermint. To fix this,
* Add non-empty validator set check to the `mm.InitGenesis` function. This will break `simapp.Setup` because it relies on an empty validator set [#comment](https://github.com/cosmos/cosmos-sdk/pull/8909#issuecomment-804850834).
* Update `simapp.Setup` to use a single validator.
* Fix failing tests (Most of them are keeper tests).
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## Description
ref: #8961
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Following up on [#9697](https://github.com/cosmos/cosmos-sdk/pull/9697#pullrequestreview-727295733), this PR is the first step for the #8961.
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- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
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- [x] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed
### Reviewers Checklist
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I have...
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- [ ] confirmed `!` in the type prefix if API or client breaking change
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* temp commit
* setbalance now is internal
* remove set balances in genesis
* feedback test commit
* update tests
* fix: genesis panic message
* fix not bonded pool
* fix(staking): genesis test
* fix(simapp): rollback state fix change
* fix(staking): genesis large val set test
* [Bank Refactor] Frojdi jonathan/remove setsupply (#8491)
* init supply in a different way
* remove external usage of set supply
* change(staking): replace SetSupply with MintCoins in tests
* change(evidence): replace SetSupply with MintCoins in tests
* change(crisis): remove SetSupply in tests
* change(bank): remove set supply from genesis tests
* change(bank): remove set supply from keeper tests
* change(bank): remove remaining set supply usage from keeper tests
* change(bank): remove set supply usage from grpc query and querier tests
* change(bank): remove SetSupply from keeper interface
Co-authored-by: Frojdi Dymylja <frojdi.dymylja@gmail.com>
* remove setbalances from genesis in gov
* remove keyring
* add init genesis state
* change(staking): make genesis checks coherent and add tests
* remove setbalances on distribution
* fix(staking): genesis tests
* [Bank Refactor]: Remove SetBalances usage from the code and tests (#8509)
* change(distribution): remove SetBalances usage from keeper tests
* add(simapp): FundAccount utility function
* chore(staking): use FundAccount in keeper tests
* change(staking): remove usage of SetBalance in allocation tests
* change(staking): remove usage of SetBalance in delegation tests
* change(staking): remove usage of SetBalance in proposal handler tests
* change(staking): remove usage of SetBalances in grpc query tests
* change(staking): remove usage of SetBalances in operations tests
* change(distribution): remove usage of SetBalances in genesis
* change(authz): remove usage of SetBalances keeper and operations test
* fix(authz): TestKeeperFees failing test
* change(slashing): remove SetBalances from expected BankKeeper
* change(slashing): remove usage of SetBalances in tests
* change(distribution): remove SetBalances from expected BankKeeper
* change(genutil): remove usage of SetBalances from tests
* change(gov): remove SetBalances from expected BankKeeper
* change(gov): remove usage of SetBalances from tests
* change(staking): remove usage of SetBalances from slash tests
* change(staking): remove SetBalances from expected BankKeeper
* change(staking): remove usage of SetBalances from delegation tests
* change(staking): remove usage of SetBalances from operations tests
* change(staking): remove usage of SetBalances from validator tests
* change(bank): remove usage of SetBalances from app tests
* change(bank): remove usage of SetBalances from bench tests
* change(bank): remove usage of SetBalances from querier tests
* change(bank): remove usage of SetBalances from grpc query tests
* change(bank): remove usage of SetBalances from operations tests
* change(bank): partially remove usage of SetBalances from keeper tests
* change(bank): finalize removal of usage of SetBalances from keeper tests
* change(auth): remove usage of SetBalances from verify tests
* change(auth): partially remove usage of SetBalances from tests
* [Bank refactor]: finalize removal of setbalances from auth (#8527)
* add tests with is check tx
* temp commit
* fix test
* fix other test and remove setbalances
* change(auth): remove usage of SetBalances is vesting tests
Co-authored-by: Jonathan Gimeno <jgimeno@gmail.com>
* change(types): remove usage of SetBalances in queries
* fix(types): pagination tests
* [Bank refactor] fix pagination tests (#8550)
* fix tests
* lint
* change(bank): remove SetBalances from keeper public API
Co-authored-by: Jonathan Gimeno <jgimeno@gmail.com>
Co-authored-by: SaReN <sahithnarahari@gmail.com>
* change(bank): remove SubtractCoins from keeper public API
* change(ibc/transfer): remove AddCoins from relay tests
* change(bank): remove AddCoins from public keeper API
* fix imports
* remove set balances
* fix fee test
* remove set balances
* fix(staking): remove dependency on minter authorization for staking pools
* chore: update CHANGELOG.md
* update: x/distribution/keeper/keeper_test.go
Co-authored-by: Robert Zaremba <robert@zaremba.ch>
* Update simapp/test_helpers.go
Co-authored-by: Robert Zaremba <robert@zaremba.ch>
* Update x/staking/genesis_test.go
Co-authored-by: Robert Zaremba <robert@zaremba.ch>
* fix(simapp): FundAccount amount variable name
* fix some PR issues
Co-authored-by: Frojdi Dymylja <frojdi.dymylja@gmail.com>
Co-authored-by: Frojdi Dymylja <33157909+fdymylja@users.noreply.github.com>
Co-authored-by: SaReN <sahithnarahari@gmail.com>
Co-authored-by: Alessio Treglia <alessio@tendermint.com>
Co-authored-by: Robert Zaremba <robert@zaremba.ch>
MD Aleem
likhita-809
Marie Gauthier
Sunny Aggarwal
Jonathan Gimeno
psaradev
Robert Zaremba
Anil Kumar Kammari
Marko
Aaron Craelius
dauTT