hg: code-tools/jtreg: Avoid fatal deprecation warning

[jonathan.gibbons at oracle.com]

Changeset: 92c443fc7b55
Author:    jjg
Date:      2020-01-30 10:32 -0800
URL:       https://hg.openjdk.java.net/code-tools/jtreg/rev/92c443fc7b55

Avoid fatal deprecation warning

! src/share/classes/com/sun/javatest/regtest/config/RegressionEnvironment.java