[jdk11u-dev] RFR: 8266254: Update to use jtreg 6

[Goetz Lindenmaier]

On Tue, 19 Jul 2022 09:19:22 GMT, George Adams <duke at openjdk.org> wrote:

> Backport required in order to bump to jtreg 6

Hi,
our testing shows a row of problems with the change. Arno already spotted some of the fixes in head, thanks! In addition there is 
test/nashorn/src/jdk/nashorn/api/scripting/test/ScriptObjectMirrorTest.java:285: error: reference to assertEquals is ambiguous
        assertEquals(42.0, obj.to(Double.class));

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PR: https://git.openjdk.org/jdk11u-dev/pull/1241