[9] RFR: 8048356: SecureRandom default provider tests

[Rajan Halade]

Please help with your review of this new test to check default provider 
used with SecureRandom.

Bug: https://bugs.openjdk.java.net/browse/JDK-8048356
Webrev: http://cr.openjdk.java.net/~rhalade/8048356/webrev.00/
Thanks,
Rajan