hg: code-tools/jtreg: fix build issues caused by latest JT Harness

[jonathan.gibbons at oracle.com]

Changeset: a7ed105176cd
Author:    jjg
Date:      2020-05-02 07:41 -0700
URL:       https://hg.openjdk.java.net/code-tools/jtreg/rev/a7ed105176cd

fix build issues caused by latest JT Harness

! src/share/classes/com/sun/javatest/regtest/report/BasicObserver.java
! src/share/classes/com/sun/javatest/regtest/tool/Tool.java