tree dd0e31cee8fb5c753a762462e9eb16f776c3ec73
parent e65731049afb6fd49da80f064fa40a28c9d5741d
author Lorenz Brun <lorenz@monogon.tech> 1637594796 +0100
committer Lorenz Brun <lorenz@monogon.tech> 1637613591 +0000

tree-wide: rewrite ioutil functions to their replacements

The ioutil package has been deprecated in Go 1.16 [1]. This CL removes
all our own users of that package and rewrites them to use their
replacements in the os package. I initially wanted to do this with a
gofix but because all replacements were signature-compatible I just
did it with a few string replaces and then ran goimports to fix up the
imports.

I intentionally didn't rewrite the patches as that would require a
different process and is IMO of less value.

[1] https://github.com/golang/go/issues/42026

Change-Id: Iac6663a1f1ee49f9b1c6e4b3d97e73f2c3b54a13
Reviewed-on: https://review.monogon.dev/c/monogon/+/449
Reviewed-by: Sergiusz Bazanski <serge@monogon.tech>