hg: jdk/sandbox: Revert to branch base for coverage purposes.

[stuart.marks at oracle.com]

Changeset: 4872fc3de1b0
Author:    smarks
Date:      2018-04-02 16:11 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/4872fc3de1b0

Revert to branch base for coverage purposes.

! test/jdk/java/util/Optional/Basic.java
! test/jdk/java/util/Optional/BasicDouble.java
! test/jdk/java/util/Optional/BasicInt.java
! test/jdk/java/util/Optional/BasicLong.java
- test/jdk/java/util/Optional/ObscureException.java