RFR: 8160605: java/util/SplittableRandom/SplittableRandomTest.java failed with timeout

[Martin Buchholz]

Hi Paul,

This deletes the testng ports of jsr166 tck random tests.

If you can remember doing any work worth keeping, other than explicitly
testing -Djava.util.secureRandomSeed=true (which we are adding to our tck
tests), let me know.

http://cr.openjdk.java.net/~martin/webrevs/openjdk9/jsr166-RandomTests/