RFR: 8230766: Changed message in IllegalMonitorStateException

[Hannes Wallnöfer]

Please review this fix for a test failing because of a changed exception 
message in java.lang.Object.wait():

JBS: https://bugs.openjdk.java.net/browse/JDK-8230766
Webrev: http://cr.openjdk.java.net/~hannesw/8230766/webrev.00/

Thanks,
Hannes