FAPI: Enable importing of private OSSL keys. #1794

Job	Run time
build-test (ubuntu-18.04, gcc)	4m 37s
build-test (ubuntu-18.04, clang)	5m 10s
build-test (ubuntu-20.04, gcc)	5m 10s
build-test (ubuntu-20.04, clang)	4m 46s
build-test (fedora-32, gcc)	5m 2s
coverity-test	0s
build-test (fedora-32, clang)	5m 21s
build-test (opensuse-leap, gcc)	4m 58s
build-test (opensuse-leap, clang)	4m 57s
test-coverage	5m 17s
build-test (ubuntu-22.04, gcc)	5m 39s
scanbuild	6m 24s
test-fuzz	2m 29s
build-test (ubuntu-22.04, clang)	5m 50s
build-test (alpine-3.15, gcc)	4m 18s
build-test (alpine-3.15, clang)	5m 13s
test-mbedtls (ubuntu-20.04)	2m 50s
test-no-crypto-build	1m 17s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 42s
test-tcti-config	14m 11s
	1h 36m 11s

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