RFR: JDK-8056176 - Expected IOE or NO UnsupportedOperationException is not thrown when setting UART Baud Rate to unsupported value

[alexey karaksin]

issue: https://bugs.openjdk.java.net/browse/JDK-8056176
webrev: http://cr.openjdk.java.net/~alkonsta/8056176/

hi,
please review the changes,
according to the spec  UnsupportedOperationException not IOException.

thanks,
Alexey.