RFR: JDK-8055209 - create initial set of SPI tests

[Stas Smirnov]

issue: JDK-8055209 <https://bugs.openjdk.java.net/browse/JDK-8055209>
webrev: 8055137 <http://cr.openjdk.java.net/%7Estsmirno/8055209/>

Hi All,

Need a review for an update.
In this update I have added 4 tests classes, to verify config, to verify 
permissions, word length and write/read operation and fixed a typo in 
the testbase class.

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Best regards,
Stas Smirnov

Stas Smirnov | Java Embedded
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