RFR 8058854: Remove dependency on dt.jar from test/tools/jar/normalize/TestNormal.java

[Amy Lu]

tools/jar/normalize/TestNormal.java use JDK dt.jar in test, this fix is 
to remove this dependency from test because with a modular dt.jar and 
the other JAR files in the JDK go away.

bug: https://bugs.openjdk.java.net/browse/JDK-8058854
webrev: http://cr.openjdk.java.net/~tyan/amylu/8058854/webrev.00/

Thanks,
Amy