RFR[12] JDK-8203687: javax/net/ssl/compatibility/Compatibility.java supports TLS 1.3

[sha.jiang at oracle.com]

Hi,
The patch adds TLS 1.3 cases for test 
javax/net/ssl/compatibility/Compatibility.java.
Beside this enhancement, it also changes the test on the following points:
1. Re-generate all certificates to use key size 2048 and SHA256 rather 
than 1024 and SHA1. And new RSA signed EC key certificates are added.
2. Each JDK build should check if a cipher suite is supported by itself. 
It's really unnecessary to maintain a predefined table for it.
3. Uses classes in javax/net/ssl/TLSCommon for defined protocols and 
cipher suites. And also adds a new common class for key algorithm.
4. Correct some statements in README.

Webrev: http://cr.openjdk.java.net/~jjiang/8203687/webrev.00/
Issue: https://bugs.openjdk.java.net/browse/JDK-8203687

Best regards,
John Jiang