RFR: JDK-8073551 Some tests in DIO VTS 1.0.1 fail due to IllegalStateException and IllegalMonitorStateException

[Sergey Nazarkin]

issue: https://bugs.openjdk.java.net/browse/JDK-8073551
review: http://cr.openjdk.java.net/~snazarki/8073551/

Hi all!

please review changes to fix DIO VTS  failures.
1) IllegalMonitorStateException is caused by notifyAll() that actually 
not necessary here
2) IllegalStateException is thrown by SPISlaveImpl.endTransaction()

-- 
/Sergey