RFR: 8273471: Add foldmultilines to UL for stdout/err [v2]

[Yasumasa Suenaga]

On Thu, 9 Sep 2021 09:23:38 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

>> test/hotspot/jtreg/runtime/logging/FoldMultilinesTest.java line 102:
>> 
>>> 100:         test("file=" + EXCEPTION_LOG_FILE);
>>> 101:         test("stdout");
>>> 102:         test("stderr");
>> 
>> I think we should add a case whe the output is not explicitly specified. I.e.,
>> 
>> 
>> -Xlog:exceptions=info:::foldmultilines=true
>
> I added test for this pattern in new commit.

I missed to check the log if output is default ("") and foldmultilines=false. So I refactored testcase.

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PR: https://git.openjdk.java.net/jdk/pull/5407