RFR(XXS): 8241951: ClhsdbCDSCore.java failed to find core file

[Chris Plummer]

Hello,

Please review the following:
https://bugs.openjdk.java.net/browse/JDK-8241951
http://cr.openjdk.java.net/~cjplummer/8241951/webrev.00/index.html

We need to disable SA core file testing on OSX 10.15.* and later when 
the binary is signed because OSX will no longer produce core files with 
this configuration.

thanks,

Chris