Add DH parameters, DSA cert and key

Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2667)

test/certs/dhp2048.pem

+-----BEGIN DH PARAMETERS-----
+MIIBCAKCAQEAoI0V5HKAcsG4LlAnVJhYnnl2ErOcdvz7WN4n+LoSkZVkfPcPExAF
+uXnT6v16rYfxCgZDPB/tSYaRhOxpJgaAHGA9PrfwprM4xQm9HLIWtidyIGtkgynQ
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+V0/iN2uElrJZIGxD2uPMZNXO+dci+EriMwIBAg==
+-----END DH PARAMETERS-----

test/certs/server-dsa-cert.pem

+-----BEGIN CERTIFICATE-----
+MIIFQzCCBCugAwIBAgIBAjANBgkqhkiG9w0BAQsFADASMRAwDgYDVQQDDAdSb290
+IENBMCAXDTE3MDIxNzE0MDgxOVoYDzIxMTcwMjE4MTQwODE5WjAVMRMwEQYDVQQD
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+L6LYw0U7GQ==
+-----END CERTIFICATE-----

test/certs/server-dsa-key.pem

+-----BEGIN PRIVATE KEY-----
+MIICZQIBADCCAjoGByqGSM44BAEwggItAoIBAQD+P3LcpaA+AYu9M1gSsHi8fixl
+7VPCsKK96oaH7/ZJqvOD0TdASkn+4Td8SPvkc+KG2bBbmp39FCxGpa4d8CRLKVbI
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+kipxvhsEIgIgFadGQ61c3i/D01zXhSsKyE0/BerqJmTrrlVK1o0ZFu8=
+-----END PRIVATE KEY-----