[9] RFR of 8078672: Print and allow setting by Java property seeds used to initialize Random instances in java.lang numerics tests

[Brian Burkhalter]

Note: This is a relabeling and extension of a patch originally addressed 
towards https://bugs.openjdk.java.net/browse/JDK-8078586 in this discussion 
thread 
http://mail.openjdk.java.net/pipermail/core-libs-dev/2015-April/033037.html.

With that preamble, please review the revised code at your convenience:

Issue:  https://bugs.openjdk.java.net/browse/JDK-8078672
Patch:  http://cr.openjdk.java.net/~bpb/8078672/webrev.00/

Summary: Add setting of Random seed via system property with fallback to a 
random seed from a separate Random instance and printing the seed actually used 
in the test.

Thanks,

Brian