RFR for JDK-8035388: TEST_BUG: java/rmi/activation/Activatable/checkActivateRef/CheckActivateRef.java fails

[Tristan Yan]

Hi All

Could you please help to review code fix for JDK-8035388.
http://cr.openjdk.java.net/~tyan/JDK-8035388/webrev.00/

Description:
method inactiveObject in ActivationGroupImpl.java, release lock happen 
before checkInactiveGroup. This makes groupInactive reset even before 
next inactiveObject started.

Regards
Tristan