## 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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* x/genutil: fix CollectTxs traversal logic
Fixes the file traversal of CollectTxs to correctly skip over
directories instead of trying to read them, failing and erroring
out.
Also while here, changed the order to perform the os read
only after the AppState UnmarshalJSON has succeeded, otherwise
an attack vector can be to purposefully request many file stats
which touches kernel resources, while just causing failures
indefinitely.
Fixes#6788
* address comments
* Fix test by passing in blank AppState
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>
Co-authored-by: SaReN <sahithnarahari@gmail.com>
Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>
Co-authored-by: Federico Kunze <federico.kunze94@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Eng Zer Jun
Robert Zaremba
Emmanuel T Odeke