hg: amber/amber: Automatic merge with datum

[maurizio.cimadamore at oracle.com]

Changeset: 6ab7f7b7a137
Author:    mcimadamore
Date:      2018-11-27 23:01 +0100
URL:       http://hg.openjdk.java.net/amber/amber/rev/6ab7f7b7a137

Automatic merge with datum

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