Add test suites for SHA-224 and SHA-384.

Relevant lines from testsuite.sha224 were verified against the test vectors in
RFC 3874, while testsuite.384 was verified against
https://www.cosic.esat.kule

Add test suites for SHA-224 and SHA-384.

Relevant lines from testsuite.sha224 were verified against the test vectors in
RFC 3874, while testsuite.384 was verified against
https://www.cosic.esat.kuleuven.be/nessie/testvectors/hash/sha/Sha-2-384.unverified.test-vectors

ok millert@

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