Do not consider failures to write files in /sys hard errors #1733

Job	Run time
coverity-test	0s
scanbuild	10m 28s
test-coverage	9m 25s
build-test (ubuntu-18.04, gcc)	7m 28s
build-test (ubuntu-18.04, clang)	8m 35s
test-fuzz	3m 42s
build-test (ubuntu-20.04, gcc)	8m 48s
test-mbedtls (ubuntu-20.04)	4m 39s
test-no-crypto-build	1m 47s
build-test (ubuntu-20.04, clang)	8m 34s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	3m 57s
test-tcti-config	29m 36s
build-test (fedora-32, gcc)	10m 45s
build-test (fedora-32, clang)	9m 43s
build-test (opensuse-leap, gcc)	7m 41s
build-test (opensuse-leap, clang)	7m 8s
build-test (ubuntu-22.04, gcc)	9m 43s
build-test (ubuntu-22.04, clang)	7m 48s
build-test (alpine-3.15, gcc)	6m 21s
build-test (alpine-3.15, clang)	10m 50s
	2h 46m 58s

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