hg: amber/amber: Automatic merge with default

[maurizio.cimadamore at oracle.com]

Changeset: 66aa2758d1fe
Author:    mcimadamore
Date:      2018-11-14 05:01 +0100
URL:       http://hg.openjdk.java.net/amber/amber/rev/66aa2758d1fe

Automatic merge with default

- test/jdk/java/lang/System/ClearProperty.java
- test/jdk/java/lang/System/SetPropertiesNull.java