[8u60] RFR: 8081022 : java/time/test/java/time/format/TestZoneTextPrinterParser.java fails by timeout on slow device

[Roger Riggs]

Please review this test modification to reduce the running time
and to apply the recommended randomness pattern.

This is the same as the JDK 9 review except that it adds the 
RandomFactory to the jdk8  test library.
(There is no existing changeset that contained only the RandomFactory to 
be backported)

Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-random-8081022/

Issue:
   https://bugs.openjdk.java.net/browse/JDK-8081022

Thanks, Roger