## 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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### Reviewers Checklist
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* unknownproto: check result from protowire.ConsumeFieldValue and return error
Given that protowire.ConsumeFieldValue returns -1 when it encounters an
error, perform a check for n < 0 and return the respectively obtained
error with context about the details.
Fixes an issue identified from a go-fuzz session, thanks to Ethan
Buchman and the IBC auditors from Informal Systems et al.
Fixes#7739.
* Address AlexanderBez's suggestions
* Use require in tests
* Add issue #7846 to TODO
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Eng Zer Jun
Emmanuel T Odeke
Amaury Martiny
Aaron Craelius
Marko