RFR: JDK-8073147 RPI board hungs on execution GetTriggerTgests_gpin30 test from DIO VTS

[alexey karaksin]

have updated the diff.
http://cr.openjdk.java.net/~amironov/8073147.1/

1. All critical and error messages contain the error explanation string.
2. Line 1049: Should message read "Can't" or Cannot" instead of "Can"?

On 18.02.2015 16:32, Jen Dority wrote:
> Line 1049: Should message read "Can't" or Cannot" instead of  "Can"?
>
> On 2/18/2015 8:27 AM, Sergey Nazarkin wrote:
>> IMO it is better to show last error for ALL ERROR/CRITICAL messages
>>
>> /Sergey
>>
>> On 18.02.2015 16:24, alexey karaksin wrote:
>>>
>>> issue: https://bugs.openjdk.java.net/browse/JDK-8073147
>>> review: http://cr.openjdk.java.net/~amironov/8073147/
>>>
>>> the issue is hard to reproduce, the changes are about printing error 
>>> cause while dealing with GPIO files is /sys filesystem.
>>
>