Code Review Request, JDK-8210974 : No extensions debug log for ClientHello

[Xuelei Fan]

Hi,

Please review this simple fix for SunJSSE debug log:
  http://cr.openjdk.java.net/~xuelei/8210974/webrev.00/
The debug log for ClientHello message does not appear in JDK 12. 
Trivial update, no new regression test.

Thanks,
Xuelei