test_pem_reading: Test loading a key from a file with multiple PEM data

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15949)

Update copyright year

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14801)

TEST: Cleanup test recipes

Name mixups cleared, and a few more test case result files that
arent't removed, making forensics on failed tests easier.

Reviewed-by: Paul Dale <paul

TEST: Cleanup test recipes

Name mixups cleared, and a few more test case result files that
arent't removed, making forensics on failed tests easier.

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14505)

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