[JDK-9] RFR: 8048610 Implement regression tests for bug fixes in JCE

[Wang Weijun]

http://cr.openjdk.java.net/~zailiu/8048610/webrev.01/webrev/

> 
>> Empty:
>> 
>> - line 48 and 49 can be fit in one line, throw -> thrown

and you don't need + anymore.

>> 
>> bug4901658:

I reread the original bug and think it's not worth adding this test.

The original bug complains byte[].toString() is not the same. This is just a misunderstanding of how the method works and once you know you should actually compare the byte elements inside, it becomes no more a problem. The bug was closed as Not-an-Issue and there is really no value creating a test for it.

--Max