[11u heads up] Upgrade to jtreg 7.3.1 and enforce it

[Lindenmaier, Goetz]

Hi,

11u is currently using jtreg 6.1. We will upgrade jtreg to 7.3.1
and enforce this as minimum version by configure.

Using latest jtreg makes testing jdk11 future-proof.
Also, a row of tests recently backported needed changes
because they would not work with jtreg 6.1.  More of
these will be encountered.

We will backport "8292716 Configure should check that jtreg is of
the required version" and later 8314495: Update to use jtreg 7.3.1.

This will reach 11.0.24, i.e. the July update. The April update
is not affected.

Best regards, Goetz.
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