hg: jdk/jdk: 8210908: Refactor java/util/prefs/PrefsSpi.sh to plain java test

[amy.lu at oracle.com]

Changeset: 09be9fd37b91
Author:    amlu
Date:      2018-10-25 11:00 +0800
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/09be9fd37b91

8210908: Refactor java/util/prefs/PrefsSpi.sh to plain java test
Reviewed-by: bchristi

! test/jdk/java/util/prefs/PrefsSpi.java
- test/jdk/java/util/prefs/PrefsSpi.sh
+ test/jdk/java/util/prefs/PrefsSpiTest.java
+ test/jdk/java/util/prefs/StubPreferences.java
+ test/jdk/java/util/prefs/StubPreferencesFactory.java