hg: amber/amber: Automatic merge with patterns-stage-1

[maurizio.cimadamore at oracle.com]

Changeset: 4397dbeb4cf4
Author:    mcimadamore
Date:      2018-11-14 05:02 +0100
URL:       http://hg.openjdk.java.net/amber/amber/rev/4397dbeb4cf4

Automatic merge with patterns-stage-1

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