RFR: 8066122: CollectionUsageThreshold.java times out when run with -XX:+ExplicitGCInvokesConcurrent

[Michail Chernov]

Hi,

Please review small fix for:
https://bugs.openjdk.java.net/browse/JDK-8066122

Webrev:
http://cr.openjdk.java.net/~eistepan/~mchernov/8066122/webrev.00/

Summary:  CollectionUsageThreshold.java hangs due to VM performs 
concurrent GC with -XX:+ExplicitGCInvokesConcurrent flag, as result - 
notification is not received. Excluded test execution with 
-XX:+ExplicitGCInvokesConcurrent.

Thanks,
Michail