## Description
The `io/ioutil` package has been deprecated in Go 1.16 (See https://golang.org/doc/go1.16#ioutil). Since cosmos-sdk has upgraded to Go 1.17 (#9987), this PR replaces the existing `io/ioutil` functions with their new definitions in `io` and `os` packages.
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## Description
Changes the `sdk.Msg` interface method `GetSigners() []string` to `GetSigners() []sdk.AccAddress`
Closes: #9885
+change GetSigner return type
+defer address checking to each msg's `ValidateBasic` method
+clean up consistency/redundancy issues in validate basic
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## Description
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closes: #9239
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## Description
ref: #9183
After some more recent conversations w/ @aaronc, I decided to go back to his original proposal of setting up a subcommand for running in-process testnets.
This PR splits the `simd testnet` command into two subcommands:
- `simd testnet start` which starts an in-process n-node testnet
- `simd testnet init-files` which sets up configuration & genesis files for an n-node testnet to be run as separate processes (one per node, most likely via Docker Compose)
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Before we can merge this PR, please make sure that all the following items have been
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- [ ] Wrote unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [x] Updated relevant documentation (`docs/`) or specification (`x/<module>/spec/`) - **see #9411**
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- [x] Added a relevant changelog entry to the `Unreleased` section in `CHANGELOG.md`
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Anil Kumar Kammari
Eng Zer Jun
Tyler
Aleksandr Bezobchuk
atheeshp
Cory
Amaury
Aaron Craelius