RFR[15] JDK-8245691: Add EdDSA certificstes to SSLSocketTemplate and CertUtils

[sha . jiang]

Hi,
This patch just adds some EdDSA, including Ed25519 and Ed448, certificates
to javax/net/ssl/SSLSocketTemplate.java and 
jdk/test/lib/security/CertUtils.java.

Please note these new certificates are not used by default.

Issue: https://bugs.openjdk.java.net/browse/JDK-8245691
Webrev: http://cr.openjdk.java.net/~jjiang/8245691/webrev.00/

Best regards,
John Jiang