RFR: JDK-8225392: Comparison builds are failing due to cacerts file

[Erik Joelsson]

Since JDK-8193255, when we started generating the cacerts file in the 
build, the build compare baseline builds have started failing. It seems 
the cacerts binary file has some non determinism built in so it doesn't 
get generated exactly the same given the same input. This patch adds 
special handling when comparing that file by comparing the output of 
"keytool -list" on the files instead.

Bug: https://bugs.openjdk.java.net/browse/JDK-8225392

Webrev: http://cr.openjdk.java.net/~erikj/8225392/webrev.01/

/Erik