RFR: JDK-8050160 - Redesign I2C implementation to properly handle transactions

[Alexey Konstantinov]

issue: https://bugs.openjdk.java.net/browse/JDK-8050160
webrev: http://cr.openjdk.java.net/~alkonsta/8050160/

Hello All,

Please review this change made in order to get an implementation that 
properly handles I2C transactions and does not internally depend on 
other components.

Thanks,
Alexey