RFR 8032377: test/java/lang/management/ThreadMXBean/ThreadBlockedCount.java still fails intermittently

[Jaroslav Bachorik]

Please, review the following test fix.

Issue : https://bugs.openjdk.java.net/browse/JDK-8032377
Webrev: http://cr.openjdk.java.net/~jbachorik/8032377/webrev.00

test/java/lang/management/ThreadMXBean/ThreadBlockedCount.java still 
fails intermittently due to locking happening at the class loading level 
which is not 100% predictable. After many tries to force predictable 
behaviour it seems that the only way to fix this is to relax the test 
condition - so the test requires that the number of times the thread 
went blocked is equal or bigger than the anticipated number (the number 
of times the test forces the thread to block).

Thanks,

-JB-