FAPI TEST: rework test certifcate creation #517

Job	Run time
scanbuild	6m 25s
coverity-test	0s
build-test (ubuntu-18.04, gcc)	4m 58s
test-coverage	5m 3s
build-test (ubuntu-18.04, clang)	4m 57s
build-test (ubuntu-20.04, gcc)	4m 55s
test-fuzz	2m 34s
build-test (ubuntu-20.04, clang)	4m 37s
test-mbedtls (ubuntu-20.04)	2m 49s
test-no-crypto-build	1m 30s
build-test (fedora-32, gcc)	4m 58s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 51s
build-test (fedora-32, clang)	4m 58s
test-tcti-config	13m 52s
build-test (opensuse-leap, gcc)	4m 57s
build-test (opensuse-leap, clang)	4m 57s
build-test (ubuntu-22.04, gcc)	4m 57s
build-test (ubuntu-22.04, clang)	4m 56s
build-test (alpine-3.15, gcc)	4m 20s
build-test (alpine-3.15, clang)	4m 58s
	1h 33m 32s

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