RFR: JDK-8055046 - apply custom Policy to the existing tests

[Stas Smirnov]

issue: JDK-8055046 <https://bugs.openjdk.java.net/browse/JDK-8055046> 
<https://bugs.openjdk.java.net/browse/JDK-8055046>
webrev: http://cr.openjdk.java.net/~stsmirno/8055046/webrev/ 
<http://cr.openjdk.java.net/%7Estsmirno/8055046/webrev/>

Hi All,

Need a review for an update.
This changes include a policy file for SPI tests, update of GPIO tests 
to start using custom Policy plus some refactoring of the logging and a 
TestBase class to store all default actions for test base classes.
-- 

Best regards,
Stas Smirnov

Stas Smirnov | Java Embedded
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